Liabilities / Assets
6th percentile
Higher debt load relative to assets than 6% of similar nonprofits.
EIN 13-3873765 • 501(c)3 • West Tisbury, MA
Profile
The arboretum is a plant science organization centered upon education, horticulture, plant exploration and conservation.
Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.
Liabilities / Assets
6th percentile
Higher debt load relative to assets than 6% of similar nonprofits.
Liabilities / Revenue
9th percentile
Higher debt load relative to revenue than 9% of similar nonprofits.
Net Margin
19th percentile
Higher net margin than 19% of similar nonprofits.
Top Officer Pay
57th percentile
Higher top officer pay than 57% of similar nonprofits.
Top officer pay equals 17.6% of source-year revenue.
Asset Growth
45th percentile
Faster asset growth than 45% of similar nonprofits.
Revenue Growth
64th percentile
Faster revenue growth than 64% of similar nonprofits.
Assets
Up$34,161,570
Up $1,213,159 (+3.7%) from 2023
Liabilities
Down$27,852
Down $2,879 (-9.4%) from 2023
Net Assets
Up$34,133,718
Up $1,216,038 (+3.7%) from 2023
Revenue
Up$1,672,116
Up $215,509 (+15%) from 2023
Expenses
Up$1,792,173
Up $80,297 (+4.7%) from 2023
Net Income
Up-$120,057
Up $135,212 (+53%) from 2023
Most recent year
2024 • Form 990Facts available. Structured filing facts are available, but richer extracted sections are limited.
The missions of the arboretum include developing, creating and maintianing a well documented collection of living plants that were propogated by mrs. Polly hill and have proved to be hardy on the island of martha's vineyard; preserving and conserving the arboretum and its gardens; providing public access to these facilities and instructing and educating students of all ages regarding botany, gardening, horticulture and topics related to the living collections of the arboretum.
Creating and maintaining a well documented collection of living plants. Educating students of all ages regarding the living collection. Providing public access to these facilities.
| Line | Beginning | End | Change |
|---|---|---|---|
| Assets | |||
| Investments in Publicly Traded Securities | $24,315,857 | $25,390,285 | ▲ $1,074,428 |
| Land, Buildings, and Equipment, Net | $6,213,635 | $6,055,718 | ▼ $157,917 |
| Investments Other Securities | $1,283,721 | $1,361,620 | ▲ $77,899 |
| Savings and Temporary Cash Investments | $805,747 | $1,060,856 | ▲ $255,109 |
| Receivables From Officers Etc | $243,690 | $168,617 | ▼ $75,073 |
| Prepaid Expenses and Deferred Charges | $52,225 | $67,204 | ▲ $14,979 |
| Pledges and Grants Receivable | $26,606 | $38,290 | ▲ $11,684 |
| Accounts Receivable | $2,950 | $15,000 | ▲ $12,050 |
| Inventories for Sale or Use | $3,980 | $3,980 | → $0 |
| Total Assets | $32,948,411 | $34,161,570 | ▲ $1,213,159 |
| Liabilities | |||
| Accounts Payable and Accrued Expenses | $30,731 | $27,852 | ▼ $2,879 |
| Total Liabilities | $30,731 | $27,852 | ▼ $2,879 |
| Net Assets / Fund Balance | |||
| Net Assets With Donor Restrictions | $22,640,655 | $23,582,702 | ▲ $942,047 |
| Net Assets Without Donor Restrictions | $10,277,025 | $10,551,016 | ▲ $273,991 |
| Total Net Assets Fund Balance | $32,917,680 | $34,133,718 | ▲ $1,216,038 |
| Total Liabilities and Net Assets / Fund Balance | $32,948,411 | $34,161,570 | ▲ $1,213,159 |
| Asset | Book Value | Depreciation | Basis |
|---|---|---|---|
| Buildings | $3,678,486 | $2,955,810 | $6,634,296 |
| Land | $2,377,232 | - | $2,377,232 |
| Period | Beginning | Contrib. | Gain/Loss | Other Uses | End |
|---|---|---|---|---|---|
| 2024 | $24,009,814 | - | ▲ $2,019,827 | $1,021,937 | $25,007,704 |
| 2023 | $22,383,724 | - | ▲ $2,623,837 | $997,747 | $24,009,814 |
| 2022 | $26,872,021 | $50,000 | ▼ $3,526,059 | $1,012,238 | $22,383,724 |
| 2021 | $24,376,950 | - | ▲ $3,397,215 | $902,144 | $26,872,021 |
| 2020 | $22,345,737 | - | ▲ $2,923,409 | $892,196 | $24,376,950 |
| Name | Title | Full / Part Time | Base | Other | Total |
|---|---|---|---|---|---|
| Timothy Boland | Executive Director | FT | $212,847 | $81,305 | $294,152 |
| Name | Title |
|---|---|
| Selena Roman | Board President |
| David Behnke | Director |
| Donna Paulnock | Director |
| Dr Meredith Murphy Westwood | Director |
| James Reynolds | Director |
| Nancy Randall | Director |
| Natalie Munn | Director |
| Nina Bramhall | Director |
| Elizabeth D Mackenty | Finance Commitee |
| Sanford Brown | Finance Committee |
| John Kennedy | Secretary |
| Dennis Bushe | Treasurer |
| Line Item | Amount |
|---|---|
| Salaries, Compensation, and Employee Benefits | $1,113,371 |
| Other Expenses | $678,802 |
| Total Fundraising Expense | $226,575 |
| Grants and Similar Amounts Paid | $0 |
| Professional Fundraising Fees | $0 |
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Other Salaries and Wages | $426,453 | $135,608 | $54,384 | $616,445 |
| Current Officers, Directors, Trustees, and Key Employees | $176,491 | $58,831 | $58,830 | $294,152 |
| Depreciation Depletion | $163,806 | $13,972 | $5,988 | $183,766 |
| Other Employee Benefits | $82,834 | $26,393 | $11,275 | $120,502 |
| Insurance | $62,024 | $19,973 | $11,259 | $93,256 |
| Payroll Taxes | $54,719 | $17,620 | $9,933 | $82,272 |
| All Other Expenses | $38,797 | $12,492 | $7,043 | $58,332 |
| Other Expenses | $19,195 | $6,181 | $3,485 | $28,861 |
| Fees for Services Accounting | - | $25,000 | - | $25,000 |
| Fees for Services Other | $14,618 | $4,708 | $2,654 | $21,980 |
| Advertising | $9,056 | $2,918 | $1,644 | $13,618 |
| Travel | $3,314 | $1,067 | $601 | $4,982 |
| Total Functional Expenses | $1,194,670 | $370,928 | $226,575 | $1,792,173 |
| Line Item | Amount |
|---|---|
| Expenses per Audited Statements | $1,792,173 |
| Total Expenses per Audited Statements | $1,792,173 |
| Total Expenses per Form 990 | $1,792,173 |
| Expenses Not Reported on Financial Statements | $0 |
| Expenses Not Reported on Form 990 | $0 |
| Line Item | Amount |
|---|---|
| Professional Fundraising Fees | $0 |
| Line Item | Beginning | End | Change |
|---|---|---|---|
| Receivables from Officers, Directors, Trustees, and Key Employees | $243,690 | $168,617 | ▼ $75,073 |
“The 990 is reviewed and approved by management, reviewed and approved by the finance committee, and then reviewed by the board.”
“The arboretum required all board members to fill out forms annually disclosing any conflicts of interest.”
“The compensation committee, made up of members of the board, determines key employees' salaries by an industry salary review from guidestar and review of forms 990 of other organizations. The committee meets and reviews the executive director's performance and determines appropriate salary.”
“The arboretum will make governing documents, conflict of interest policy, and financial statements available to the public upon written request of any interested party.”
“The arboretum accounted for the proceeds as revenue in the year the easement was received.”
This appendix keeps the raw XML leaves available for debugging and edge-case review. The human report above is the primary experience.
| Path | # | Value |
|---|---|---|
| IRS990/AccountantCompileOrReviewInd | 0 | 0 |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 30731 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 27852 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 2950 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 15000 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | CREATING AND MAINTAINING A WELL DOCUMENTED COLLECTION OF LIVING PLANTS. EDUCATING STUDENTS OF ALL AGES REGARDING THE LIVING COLLECTION. PROVIDING PUBLIC ACCESS TO THESE FACILITIES. |
| IRS990/AdvertisingGrp/FundraisingAmt | 0 | 1644 |
| IRS990/AdvertisingGrp/ManagementAndGeneralAmt | 0 | 2918 |
| IRS990/AdvertisingGrp/ProgramServicesAmt | 0 | 9056 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 13618 |
| IRS990/AllOtherContributionsAmt | 0 | 544055 |
| IRS990/AllOtherExpensesGrp/FundraisingAmt | 0 | 7043 |
| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | 12492 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 38797 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 58332 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | 1 |
| IRS990/AuditCommitteeInd | 0 | 1 |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | MARGO URBANY-JOYCE |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 5086939426 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 809 STATE ROAD |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | WEST TISBURY |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 02575 |
| IRS990/BusinessRlnWith35CtrlEntInd | 0 | 0 |
| IRS990/BusinessRlnWithFamMemInd | 0 | 0 |
| IRS990/BusinessRlnWithOrgMemInd | 0 | 0 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/CollectionsOfArtInd | 0 | 0 |
| IRS990/CompCurrentOfcrDirectorsGrp/FundraisingAmt | 0 | 58830 |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 58831 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 176491 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 294152 |
| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 1 |
| IRS990/CompensationProcessOtherInd | 0 | 1 |
| IRS990/ConflictOfInterestPolicyInd | 0 | 1 |
| IRS990/ConservationEasementsInd | 0 | 1 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 0 |
| IRS990/CreditCounselingInd | 0 | 0 |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 629780 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 864619 |
| IRS990/CYOtherExpensesAmt | 0 | 678802 |
| IRS990/CYOtherRevenueAmt | 0 | 0 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 177717 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | -120057 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 1113371 |
| IRS990/CYTotalExpensesAmt | 0 | 1792173 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 226575 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 1672116 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 0 |
| IRS990/DeductibleArtContributionInd | 0 | 0 |
| IRS990/DeductibleNonCashContriInd | 0 | 0 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/DepreciationDepletionGrp/FundraisingAmt | 0 | 5988 |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 13972 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 163806 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 183766 |
| IRS990/Desc | 0 | RESEARCH AND STUDY OF PLANTS AND OTHER ASPECTS OF GARDENING AND HORTICULTURE PARTICULARLY WITH REFERENCE TO RARE PLANTS GROWN IN THE ARBORETUM. INVITING AUTHORITIES IN THE FIELD FOR CONSULTATION AND GUIDANCE AND MAINTAINING DOCUMENTATION OF THE LIVING PLANTS. |
| IRS990/DescribedInSection501c3Ind | 0 | 1 |
| IRS990/DisregardedEntityInd | 0 | 0 |
| IRS990/DocumentRetentionPolicyInd | 0 | 1 |
| IRS990/DonorAdvisedFundInd | 0 | 0 |
| IRS990/DonorRestrictionNetAssetsGrp/BOYAmt | 0 | 22640655 |
| IRS990/DonorRestrictionNetAssetsGrp/EOYAmt | 0 | 23582702 |
| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | 1 |
| IRS990/ElectionOfBoardMembersInd | 0 | 0 |
| IRS990/EmployeeCnt | 0 | 16 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | 1 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 1179541 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 0 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 0 |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 25000 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 25000 |
| IRS990/FeesForServicesOtherGrp/FundraisingAmt | 0 | 2654 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 4708 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 14618 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 21980 |
| IRS990/ForeignActivitiesInd | 0 | 0 |
| IRS990/ForeignFinancialAccountInd | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | 0 |
| IRS990/Form8282PropertyDisposedOfInd | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 12 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 6 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 7 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 8 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 9 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 10 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 11 | X |
| IRS990/Form990PartVIISectionAGrp/KeyEmployeeInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 12 | 41305 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | SANFORD BROWN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | DENNIS BUSHE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | DAVID BEHNKE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | DR MEREDITH MURPHY WESTWOOD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | NINA BRAMHALL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | SELENA ROMAN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | JOHN KENNEDY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | ELIZABETH D MACKENTY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | DONNA PAULNOCK |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | NATALIE MUNN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | NANCY RANDALL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | JAMES REYNOLDS |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | TIMOTHY BOLAND |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 8 | 0 |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 12 | 252847 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | FINANCE COMMITTEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | TREASURER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | BOARD PRESIDENT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | SECRETARY |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | FINANCE COMMITEE |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | EXECUTIVE DIRECTOR |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 1996 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | 1 |
| IRS990/FundraisingActivitiesInd | 0 | 0 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 123949 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 12 |
| IRS990/GrantsToIndividualsInd | 0 | 0 |
| IRS990/GrantsToOrganizationsInd | 0 | 0 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 11530158 |
| IRS990/GrossReceiptsAmt | 0 | 13078325 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 0 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 1 |
| IRS990/IndependentVotingMemberCnt | 0 | 12 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 1 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InsuranceGrp/FundraisingAmt | 0 | 11259 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 19973 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 62024 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 93256 |
| IRS990/InventoriesForSaleOrUseGrp/BOYAmt | 0 | 3980 |
| IRS990/InventoriesForSaleOrUseGrp/EOYAmt | 0 | 3980 |
| IRS990/InvestmentExpenseAmt | 0 | -142966 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 740670 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 740670 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/InvestmentsOtherSecuritiesGrp/BOYAmt | 0 | 1283721 |
| IRS990/InvestmentsOtherSecuritiesGrp/EOYAmt | 0 | 1361620 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 24315857 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 25390285 |
| IRS990/IRPDocumentCnt | 0 | 14 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 2955810 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 6213635 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 6055718 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 9011528 |
| IRS990/LegalDomicileStateCd | 0 | DE |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 11406209 |
| IRS990/LoanOutstandingInd | 0 | 1 |
| IRS990/LobbyingActivitiesInd | 0 | 0 |
| IRS990/LocalChaptersInd | 0 | 0 |
| IRS990/MaterialDiversionOrMisuseInd | 0 | 0 |
| IRS990/MembershipDuesAmt | 0 | 85725 |
| IRS990/MembersOrStockholdersInd | 0 | 0 |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | 1 |
| IRS990/MinutesOfGoverningBodyInd | 0 | 1 |
| IRS990/MissionDesc | 0 | THE ARBORETUM IS A PLANT SCIENCE ORGANIZATION CENTERED UPON EDUCATION, HORTICULTURE, PLANT EXPLORATION AND CONSERVATION. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 32917680 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 34133718 |
| IRS990/NetGainOrLossInvestmentsGrp/ExclusionAmt | 0 | 123949 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 123949 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | 1479061 |
| IRS990/NoDonorRestrictionNetAssetsGrp/BOYAmt | 0 | 10277025 |
| IRS990/NoDonorRestrictionNetAssetsGrp/EOYAmt | 0 | 10551016 |
| IRS990/NoListedPersonsCompensatedInd | 0 | X |
| IRS990/NondeductibleContributionsInd | 0 | 0 |
| IRS990/OfficerMailingAddressInd | 0 | 0 |
| IRS990/OperateHospitalInd | 0 | 0 |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsFASB117Ind | 0 | X |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 0 |
| IRS990/OtherEmployeeBenefitsGrp/FundraisingAmt | 0 | 11275 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 26393 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 82834 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 120502 |
| IRS990/OtherExpensesGrp/Desc | 0 | MAINTENANCE AND REPAIRS |
| IRS990/OtherExpensesGrp/Desc | 1 | SUPPLIES |
| IRS990/OtherExpensesGrp/Desc | 2 | SPECIAL EVENT COSTS |
| IRS990/OtherExpensesGrp/Desc | 3 | PRINTING AND PUBLICATIO |
| IRS990/OtherExpensesGrp/FundraisingAmt | 0 | 21053 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 1 | 4972 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 2 | 33454 |
| IRS990/OtherExpensesGrp/FundraisingAmt | 3 | 3485 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 37346 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 1 | 8819 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 2 | 6181 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 115976 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 27387 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 19195 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 174375 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 41178 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 33454 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 28861 |
| IRS990/OtherSalariesAndWagesGrp/FundraisingAmt | 0 | 54384 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 135608 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 426453 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 616445 |
| IRS990/PartialLiquidationInd | 0 | 0 |
| IRS990/PayrollTaxesGrp/FundraisingAmt | 0 | 9933 |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 17620 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 54719 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 82272 |
| IRS990/PledgesAndGrantsReceivableGrp/BOYAmt | 0 | 26606 |
| IRS990/PledgesAndGrantsReceivableGrp/EOYAmt | 0 | 38290 |
| IRS990/PoliticalCampaignActyInd | 0 | 0 |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 52225 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 67204 |
| IRS990/PrincipalOfficerNm | 0 | TIMOTHY BOLAND |
| IRS990/ProfessionalFundraisingInd | 0 | 0 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 713990 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | PROGRAM SERVICES |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 177717 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 177717 |
| IRS990/ProgSrvcAccomActy2Grp/Desc | 0 | EDUCATING THE PUBLIC REGARDING VARIOUS PLANTS, GARDENING, AND HORTICULTURE THROUGH EDUCATIONAL SEMINARS AND LECTURES. |
| IRS990/ProgSrvcAccomActy2Grp/ExpenseAmt | 0 | 15129 |
| IRS990/ProgSrvcAccomActy2Grp/RevenueAmt | 0 | 5908 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | 0 |
| IRS990/PYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/PYContributionsGrantsAmt | 0 | 645927 |
| IRS990/PYExcessBenefitTransInd | 0 | 0 |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/PYInvestmentIncomeAmt | 0 | 681169 |
| IRS990/PYOtherExpensesAmt | 0 | 641385 |
| IRS990/PYOtherRevenueAmt | 0 | 0 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 129511 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | -255269 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 1070491 |
| IRS990/PYTotalExpensesAmt | 0 | 1711876 |
| IRS990/PYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/PYTotalRevenueAmt | 0 | 1456607 |
| IRS990/QuidProQuoContributionsInd | 0 | 0 |
| IRS990/ReceivablesFromOfficersEtcGrp/BOYAmt | 0 | 243690 |
| IRS990/ReceivablesFromOfficersEtcGrp/EOYAmt | 0 | 168617 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | -120057 |
| IRS990/RegularMonitoringEnfrcInd | 0 | 1 |
| IRS990/RelatedEntityInd | 0 | 0 |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | 0 |
| IRS990/ReportInvestmentsOtherSecInd | 0 | 0 |
| IRS990/ReportLandBuildingEquipmentInd | 0 | 1 |
| IRS990/ReportOtherAssetsInd | 0 | 0 |
| IRS990/ReportOtherLiabilitiesInd | 0 | 0 |
| IRS990/ReportProgramRelatedInvstInd | 0 | 0 |
| IRS990/RevenueAmt | 0 | 171808 |
| IRS990/SavingsAndTempCashInvstGrp/BOYAmt | 0 | 805747 |
| IRS990/SavingsAndTempCashInvstGrp/EOYAmt | 0 | 1060856 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearAmt | 0 | 629780 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus1YearAmt | 0 | 645927 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 1202608 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 563463 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 645717 |
| IRS990ScheduleA/GiftsGrantsContriRcvd170Grp/TotalAmt | 0 | 3687495 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearAmt | 0 | 740670 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus1YearAmt | 0 | 598032 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 548652 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 608385 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 367261 |
| IRS990ScheduleA/GrossInvestmentIncome170Grp/TotalAmt | 0 | 2863000 |
| IRS990ScheduleA/GrossReceiptsRltdActivitiesAmt | 0 | 519190 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 130330 |
| IRS990ScheduleA/OtherIncome170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 123500 |
| IRS990ScheduleA/OtherIncome170Grp/TotalAmt | 0 | 253830 |
| IRS990ScheduleA/PublicOrganization170Ind | 0 | X |
| IRS990ScheduleA/PublicSupportCY170Pct | 0 | 0.45870 |
| IRS990ScheduleA/PublicSupportPY170Pct | 0 | 0.45000 |
| IRS990ScheduleA/PublicSupportTotal170Amt | 0 | 3121171 |
| IRS990ScheduleA/SubstantialContributorsTotAmt | 0 | 566324 |
| IRS990ScheduleA/ThirtyThrPctSuprtTestsCY170Ind | 0 | X |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearAmt | 0 | 629780 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus1YearAmt | 0 | 645927 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus2YearsAmt | 0 | 1202608 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus3YearsAmt | 0 | 563463 |
| IRS990ScheduleA/TotalCalendarYear170Grp/CurrentTaxYearMinus4YearsAmt | 0 | 645717 |
| IRS990ScheduleA/TotalCalendarYear170Grp/TotalAmt | 0 | 3687495 |
| IRS990ScheduleA/TotalSupportAmt | 0 | 6804325 |
| IRS990ScheduleB/ContributorInformationGrp/ContributorBusinessName/BusinessNameLine1 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorNum | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/AddressLine1 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/AddressLine2 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/City | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/State | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/ZIPCode | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/TotalContributionsAmt | 0 | RESTRICTED |
| IRS990/ScheduleBRequiredInd | 0 | 1 |
| IRS990ScheduleD/BuildingsGrp/BookValueAmt | 0 | 3678486 |
| IRS990ScheduleD/BuildingsGrp/DepreciationAmt | 0 | 2955810 |
| IRS990ScheduleD/BuildingsGrp/OtherCostOrOtherBasisAmt | 0 | 6634296 |
| IRS990ScheduleD/CYEndwmtFundGrp/BeginningYearBalanceAmt | 0 | 24009814 |
| IRS990ScheduleD/CYEndwmtFundGrp/EndYearBalanceAmt | 0 | 25007704 |
| IRS990ScheduleD/CYEndwmtFundGrp/InvestmentEarningsOrLossesAmt | 0 | 2019827 |
| IRS990ScheduleD/CYEndwmtFundGrp/OtherExpendituresAmt | 0 | 1021937 |
| IRS990ScheduleD/CYMinus1YrEndwmtFundGrp/BeginningYearBalanceAmt | 0 | 22383724 |
| IRS990ScheduleD/CYMinus1YrEndwmtFundGrp/EndYearBalanceAmt | 0 | 24009814 |
| IRS990ScheduleD/CYMinus1YrEndwmtFundGrp/InvestmentEarningsOrLossesAmt | 0 | 2623837 |
| IRS990ScheduleD/CYMinus1YrEndwmtFundGrp/OtherExpendituresAmt | 0 | 997747 |
| IRS990ScheduleD/CYMinus2YrEndwmtFundGrp/BeginningYearBalanceAmt | 0 | 26872021 |
| IRS990ScheduleD/CYMinus2YrEndwmtFundGrp/ContributionsAmt | 0 | 50000 |
| IRS990ScheduleD/CYMinus2YrEndwmtFundGrp/EndYearBalanceAmt | 0 | 22383724 |
| IRS990ScheduleD/CYMinus2YrEndwmtFundGrp/InvestmentEarningsOrLossesAmt | 0 | -3526059 |
| IRS990ScheduleD/CYMinus2YrEndwmtFundGrp/OtherExpendituresAmt | 0 | 1012238 |
| IRS990ScheduleD/CYMinus3YrEndwmtFundGrp/BeginningYearBalanceAmt | 0 | 24376950 |
| IRS990ScheduleD/CYMinus3YrEndwmtFundGrp/EndYearBalanceAmt | 0 | 26872021 |
| IRS990ScheduleD/CYMinus3YrEndwmtFundGrp/InvestmentEarningsOrLossesAmt | 0 | 3397215 |
| IRS990ScheduleD/CYMinus3YrEndwmtFundGrp/OtherExpendituresAmt | 0 | 902144 |
| IRS990ScheduleD/CYMinus4YrEndwmtFundGrp/BeginningYearBalanceAmt | 0 | 22345737 |
| IRS990ScheduleD/CYMinus4YrEndwmtFundGrp/EndYearBalanceAmt | 0 | 24376950 |
| IRS990ScheduleD/CYMinus4YrEndwmtFundGrp/InvestmentEarningsOrLossesAmt | 0 | 2923409 |
| IRS990ScheduleD/CYMinus4YrEndwmtFundGrp/OtherExpendituresAmt | 0 | 892196 |
| IRS990ScheduleD/EndowmentsHeldRelatedOrgInd | 0 | 0 |
| IRS990ScheduleD/EndowmentsHeldUnrelatedOrgInd | 0 | 0 |
| IRS990ScheduleD/ExpensesNotReportedAmt | 0 | 0 |
| IRS990ScheduleD/ExpensesNotRptFinclStmtAmt | 0 | 0 |
| IRS990ScheduleD/ExpensesSubtotalAmt | 0 | 1792173 |
| IRS990ScheduleD/InvestmentExpensesNotIncldAmt | 0 | 142966 |
| IRS990ScheduleD/LandGrp/BookValueAmt | 0 | 2377232 |
| IRS990ScheduleD/LandGrp/OtherCostOrOtherBasisAmt | 0 | 2377232 |
| IRS990ScheduleD/NetUnrealizedGainsInvstAmt | 0 | 1479061 |
| IRS990ScheduleD/PreservationOpenSpaceInd | 0 | X |
| IRS990ScheduleD/PreservationPublicUseInd | 0 | X |
| IRS990ScheduleD/ProtectionNaturalHabitatInd | 0 | X |
| IRS990ScheduleD/RevenueNotReportedAmt | 0 | 1479061 |
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