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Private foundations don’t post open calls, so nobody can search them. We read IRS filings instead — 9.6 million grants from 174,053 foundations and grantmaking charities, searchable by what the money was actually for.

12 funders with a record of paying for “arboretum”

Where the money went

1.0×
Minnesota Landscape Arboretum Foundation → University of Minnesota Landscape Arboretum: $44M across 4 grants, latest 2024The Chicago Community Trust → University of Utah: $6.8M across 3 grants, latest 2022Community Fdn of Greater Des Moines → The Brenton Arboretum Inc: $2.2M across 6 grants, latest 2023Walder Foundation → Morton Arboretum: $1.5M across 9 grants, latest 2024The William Penn Foundation → Awbury Arboretum Association Inc: $575K across 3 grants, latest 2023Gs Donor Advised Philanthropy Fund → The Arnold Arboretum Committee Inc: $521K across 1 grant, latest 2022Seattle Foundation → Arboretum Foundation: $195K across 15 grants, latest 2024International Paper Company Foundation → Hoyt Arboretum Friends Foundation: $150K across 3 grants, latest 2024The C K Williams Fdn Inv Adv Acct → Mountain Top Arboretum: $150K across 2 grants, latest 2025The Ayco Charitable Foundation → Minnesota Landscape Arboretum Foundation: $60K across 4 grants, latest 2025Center for Plant Conservation Inc → The Arboretum at Flagstaff: $56K across 4 grants, latest 2024Frank and Evelyn Schmidt Family → Hoyt Arboretum Friends: $30K across 4 grants, latest 2024The Chicago Community Trust → Dallas Arboretum & Botanical Society Inc: $500K across 2 grants, latest 2021Community Fdn of Greater Des Moines → Friends of West Des Moines Parks and Recreation: $500K across 2 grants, latest 2023The William Penn Foundation → University of Pennsylvania - Morris Arboretum: $176K across 6 grants, latest 2024International Paper Company Foundation → The Morton Arboretum: $150K across 3 grants, latest 2024Gs Donor Advised Philanthropy Fund → Holden Arboretum: $80K across 3 grants, latest 2024The C K Williams Fdn Inv Adv Acct → Friends of the National Arboretum: $75K across 3 grants, latest 2025The Ayco Charitable Foundation → North Carolina Arboretum Society: $50K across 1 grant, latest 2022Center for Plant Conservation Inc → Friends of Lyon Arboretum: $28K across 4 grants, latest 2024Frank and Evelyn Schmidt Family → Friends of the National Arboretum: $20K across 2 grants, latest 2024The Chicago Community Trust → Morton Arboretum: $467K across 4 grants, latest 2023Community Fdn of Greater Des Moines → Iowa Arboretum: $273K across 3 grants, latest 2023International Paper Company Foundation → Minnesota Landscape Arboretum Foundation: $150K across 3 grants, latest 2024Gs Donor Advised Philanthropy Fund → Awbury Arboretum Association Inc: $60K across 2 grants, latest 2024The Ayco Charitable Foundation → Friends of the National Arboretum Inc: $30K across 1 grant, latest 2023Center for Plant Conservation Inc → Ucsc Arboretum and Botanical Garden Native Plant Program: $26K across 1 grant, latest 2024The William Penn Foundation → Jenkins Arboretum: $25K across 4 grants, latest 2024The C K Williams Fdn Inv Adv Acct → Friends of the National Arboretum Inc: $25K across 1 grant, latest 2023Frank and Evelyn Schmidt Family → Morton Arboretum: $18K across 2 grants, latest 2023International Paper Company Foundation → Dallas Arboretum: $125K across 3 grants, latest 2024Gs Donor Advised Philanthropy Fund → Arboretum Foundation: $40K across 3 grants, latest 2024The Ayco Charitable Foundation → Dallas Arboretum & Botanical: $28K across 4 grants, latest 2025Gs Donor Advised Philanthropy Fund → Reeves-Reed Arboretum: $26K across 2 grants, latest 2024The C K Williams Fdn Inv Adv Acct → Mountaintop Arboretum: $25K across 1 grant, latest 2023Center for Plant Conservation Inc → The Arnold Arboretum of Harvard University: $22K across 4 grants, latest 2024Center for Plant Conservation Inc → Waimea Arboretum Foundation: $22K across 4 grants, latest 2024Community Fdn of Greater Des Moines → Newton Arboretum & Botanical Gardens: $20K across 1 grant, latest 2024International Paper Company Foundation → Friends of the National Arboretum Inc: $18K across 3 grants, latest 2024The William Penn Foundation → Adkins Arboretum Ltd: $16K across 4 grants, latest 2024The William Penn Foundation → John J Tyler Arboretum: $16K across 4 grants, latest 2024Gs Donor Advised Philanthropy Fund → Dallas Arboretum & Botanical: $14K across 1 grant, latest 2024The C K Williams Fdn Inv Adv Acct → Arnold Arboretum: $10K across 1 grant, latest 2025The C K Williams Fdn Inv Adv Acct → Arnold Arboretum of Harvard University: $10K across 1 grant, latest 2024The Ayco Charitable Foundation → Los Angeles Arboretum Foundation Inc: $10K across 1 grant, latest 2024Frank and Evelyn Schmidt Family → Tulsa Botanic Garden: $10K across 2 grants, latest 2023International Paper Company Foundation → Cal State Fullerton Philanthropic Foundation: $5K across 2 grants, latest 2024Frank and Evelyn Schmidt Family → Bernheim Arboretum and Research Forest: $5K across 1 grant, latest 2022International Paper Company Foundation → Flint River Farm School Preservation Society: $3K across 1 grant, latest 2023International Paper Company Foundation → Bartlett Arboretum Association Inc: $3K across 2 grants, latest 2024Frank and Evelyn Schmidt Family → Virginia Tech: $3K across 1 grant, latest 2023Frank and Evelyn Schmidt Family → Minnesota Landscape Arboretum: $2K across 1 grant, latest 2021Minnesota Landscape Arboretum Foundation: $44M on this topic. Open the funder.Minnesota Landscape Arboretum…$44MThe Chicago Community Trust: $7.7M on this topic. Open the funder.The Chicago Community Trust$7.7MCommunity Fdn of Greater Des Moines: $3.0M on this topic. Open the funder.Community Fdn of Greater Des…$3.0MWalder Foundation: $1.5M on this topic. Open the funder.Walder Foundation$1.5MThe William Penn Foundation: $808K on this topic. Open the funder.The William Penn Foundation$808KGs Donor Advised Philanthropy Fund: $741K on this topic. Open the funder.Gs Donor Advised Philanthropy…$741KInternational Paper Company Foundation: $604K on this topic. Open the funder.International Paper Company F…$604KThe C K Williams Fdn Inv Adv Acct: $295K on this topic. Open the funder.The C K Williams Fdn Inv Adv…$295KSeattle Foundation: $195K on this topic. Open the funder.Seattle Foundation$195KThe Ayco Charitable Foundation: $178K on this topic. Open the funder.The Ayco Charitable Foundation$178KCenter for Plant Conservation Inc: $154K on this topic. Open the funder.Center for Plant Conservation…$154KFrank and Evelyn Schmidt Family: $87K on this topic. Open the funder.Frank and Evelyn Schmidt Fami…$87KUniversity of Minnesota Landscape Arboretum: received $44M on this topicUniversity of Minnesota Landsca…$44MUniversity of Utah: received $6.8M on this topicUniversity of Utah$6.8MThe Brenton Arboretum Inc: received $2.2M on this topicThe Brenton Arboretum Inc$2.2MMorton Arboretum: received $1.6M on this topicMorton Arboretum$1.6MAwbury Arboretum Association Inc: received $635K on this topicAwbury Arboretum Association Inc$635KThe Arnold Arboretum Committee Inc: received $521K on this topicThe Arnold Arboretum Committee…$521KDallas Arboretum & Botanical Society Inc: received $500K on this topicDallas Arboretum & Botanical So…$500KFriends of West Des Moines Parks and Recreation: received $500K on this topicFriends of West Des Moines Park…$500KMorton Arboretum: received $467K on this topicMorton Arboretum$467KIowa Arboretum: received $273K on this topicIowa Arboretum$273KArboretum Foundation: received $236K on this topicArboretum Foundation$236KMinnesota Landscape Arboretum Foundation: received $210K on this topicMinnesota Landscape Arboretum F…$210KUniversity of Pennsylvania - Morris Arboretum: received $176K on this topicUniversity of Pennsylvania - Mo…$176KHoyt Arboretum Friends Foundation: received $150K on this topicHoyt Arboretum Friends Foundati…$150KMountain Top Arboretum: received $150K on this topicMountain Top Arboretum$150KThe Morton Arboretum: received $150K on this topicThe Morton Arboretum$150KDallas Arboretum: received $125K on this topicDallas Arboretum$125KFriends of the National Arboretum: received $95K on this topicFriends of the National Arboret…$95KHolden Arboretum: received $80K on this topicHolden Arboretum$80KFriends of the National Arboretum Inc: received $73K on this topicFriends of the National Arboret…$73KThe Arboretum at Flagstaff: received $56K on this topicThe Arboretum at Flagstaff$56KNorth Carolina Arboretum Society: received $50K on this topicNorth Carolina Arboretum Society$50KDallas Arboretum & Botanical: received $42K on this topicDallas Arboretum & Botanical$42KHoyt Arboretum Friends: received $30K on this topicHoyt Arboretum Friends$30KFriends of Lyon Arboretum: received $28K on this topicFriends of Lyon Arboretum$28KReeves-Reed Arboretum: received $26K on this topicReeves-Reed Arboretum$26KUcsc Arboretum and Botanical Garden Native Plant Program: received $26K on this topicUcsc Arboretum and Botanical Ga…$26KJenkins Arboretum: received $25K on this topicJenkins Arboretum$25KMountaintop Arboretum: received $25K on this topicMountaintop Arboretum$25KThe Arnold Arboretum of Harvard University: received $22K on this topicThe Arnold Arboretum of Harvard…$22KWaimea Arboretum Foundation: received $22K on this topicWaimea Arboretum Foundation$22KNewton Arboretum & Botanical Gardens: received $20K on this topicNewton Arboretum & Botanical Ga…$20KAdkins Arboretum Ltd: received $16K on this topicAdkins Arboretum Ltd$16KJohn J Tyler Arboretum: received $16K on this topicJohn J Tyler Arboretum$16KArnold Arboretum: received $10K on this topicArnold Arboretum$10KArnold Arboretum of Harvard University: received $10K on this topicArnold Arboretum of Harvard Uni…$10KLos Angeles Arboretum Foundation Inc: received $10K on this topicLos Angeles Arboretum Foundatio…$10KTulsa Botanic Garden: received $10K on this topicTulsa Botanic Garden$10KCal State Fullerton Philanthropic Foundation: received $5K on this topicCal State Fullerton Philanthrop…$5KBernheim Arboretum and Research Forest: received $5K on this topicBernheim Arboretum and Research…$5KFlint River Farm School Preservation Society: received $3K on this topicFlint River Farm School Preserv…$3KBartlett Arboretum Association Inc: received $3K on this topicBartlett Arboretum Association…$3KVirginia Tech: received $3K on this topicVirginia Tech$3KMinnesota Landscape Arboretum: received $2K on this topicMinnesota Landscape Arboretum$2K
12 funders, 44 recipients, grants matching “arboretum” only. Ribbon width is proportional to the total given; each funder has its own colour (smaller funders in gray). Hover a name to isolate its flows, click a funder to open it. Drag to move around; zoom with the buttons, a double-click, or the wheel after clicking the map.

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Source: IRS Form 990-PF Part XV and Form 990 Schedule I, tax years 2019–2025. These are grants already paid, a record of what an organization funds rather than an open call. Private foundations rarely accept unsolicited applications and the route in is usually a program officer; grantmaking charities and associations more often run real application cycles, so check their website. How this data is built, and its limits →