California · Nonprofit
LOS ANGELES ARBORETUM FOUNDATION INC
LOS ANGELES ARBORETUM FOUNDATION INC (California) receives grants from 46 organizations whose IRS filings report $4,596,378 to it, the largest being VANGUARD CHARITABLE ENDOWMENT PROGRAM ($550,000). 29 of them have funded it in more than one year.
- Revenue FY2025
- $5.8M
- Funders on record
- 46
- Grants received
- $4.6M
- Net assets
- $5.4M
What Los Angeles Arboretum Foundation Inc does
Mission
To cultivate its natural, horticultural, and historic resources for learning, enjoyment and inspiration. The los angeles arboretum foundation secures philanthropic gifts in support of this mission.
As stated on its FY2025 Form 990.
Programs
Home to one of the world's finest collections of mediterranean and subtropical plants, the 127-acre los angeles county arboretum & botanic garden serves as an important repository for species of biological and economic importance. The arboretum landscape also serves as a richhistorical site that includes native american, rancho period, and late 19th century treasures, including four historic landmark buildings.in agreement with los angeles county, the foundation is responsible for the admissions, filming, weddings and site rentals. Admissions revenues help to support the programs of the los angeles county arboretum & botanic garden.
$1,754,145 spent$980,591 earned by the program78% of program spendingIn addition to its extensive visitor tour program, the los angeles county arboretum & botanic garden offers activities and events that cater to every audience, serving over 500,000 visitors a year. Adult education programs provide instruction in horticulture, the natural sciences, and environmental stewardship practices for use in home, school, and community gardens. Services for public schools provide field trips and other science and history curricula enrichment programs to over 18,000 students annually, with 70% visiting from title I schools (where at least 40% of students are from low-income families).
$490,793 spent$993,414 earned by the program22% of program spending
The 2 programs described on its FY2024 Form 990, listed largest first by expense. Program spending in total: $2,244,938.
The organization over time
Each line starts at 100 in 2017, so what you read is the shape rather than the size: 150 means half as much again as 2017, 50 means half. The number beside each label in the key is where it ended. The shaded band is where the middle 50% of its peers' revenue would sit, given their growth.
Balance sheet
Total assets and total liabilities at each year end, in dollars. The largest one-year move in total assets was 2022 to 2023, from $19M to $11M (−43%).
How it's funded, over time
Each bar is one year's revenue split into where it came from, and every bar is the same height — these are shares, not amounts, so a year that raised twice as much looks the same size. Hover a bar for the split.
Government-grant reliance: 2020 17% · 2021 17% · 2023 4% · 2024 2% · 2025 4%. Grants only. Government contracts and fees sit inside program revenue.
59% of LOS ANGELES ARBORETUM FOUNDATION INC’s revenue is contributions — about as donation-reliant as the typical peer (88% for the typical peer).
Surplus & reserves
Operating surplus or deficit each year, and months of liquidity in hand. 3 of the last 9 reported years ran a deficit.
reserve
Leadership and staff
The officers, directors, trustees and key employees listed on each return. Joined and no longer listed compare each filing with the year before, matching people by surname and first initial; a year after a gap, or a roster under three people, has no comparison.
The chief executive listed changed between the FY2023 and FY2024 filings.
Who funds it, year by year
2017 → 2023: the base broadened from 7 funders to 26 funders, grant income rose $135k → $2.1M.
13 of 46 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 44% of grant dollars received. That money is really individual donors directing a sponsor; the institutions to cultivate are the non-DAF funders.
From the IRS filings of LOS ANGELES ARBORETUM FOUNDATION INC’s funders (the co-funder graph). Top 30 of 46 funders by total. Association, not causation. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
How concentrated its funding is
LOS ANGELES ARBORETUM FOUNDATION INC has a broad base — no single funder exceeds 12% of grant income, and it takes 5 funders to reach half.
the vertical line marks half of all grant income — 5 funders to its left
51% of the income these shares are computed over arrives through pass-through sponsors or from payers whose filings do not say what kind of payment it is. Concentration is still measured over all of it, because the money is real; what it does not support is a claim about how many institutions have chosen to fund LOS ANGELES ARBORETUM FOUNDATION INC.
Largest funder’s share by year: 2017 37% · 2018 19% · 2019 30% · 2020 33% · 2021 28% · 2022 34% · 2023 27% — diversifying over time.
“Effective funders” = inverse Herfindahl index (1 / Σ shareᵢ²) — the number of equal-sized funders that would give the same concentration. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
How long its funders stay
57% of LOS ANGELES ARBORETUM FOUNDATION INC's funders are still giving 3 years after their first grant; 63% give in more than one year at all.
Share of funders still giving k years after their first recorded grant, pooled across every acquisition cohort. A funder counts as retained in a year only if it made a grant that year. Measured to FY2023, the last fiscal year that has finished arriving — a funder cannot be counted as lapsed in a year most filers have not reached.
Where its funders are
72% of LOS ANGELES ARBORETUM FOUNDATION INC's grant income comes from California funders.
In-state vs out-of-state, by year
Funder states come from each funder’s own filing. $2.0M arriving through sponsors registered in 11 states is excluded from the map and the split above: a sponsor holds money on a donor’s behalf, so its registered address would place those dollars somewhere no donor need ever have been. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
Against its field
LOS ANGELES ARBORETUM FOUNDATION INC is better cushioned than half of the 1,074 environment nonprofits its size.
this organization peer median middle 50% of peers· 1,074 environment nonprofits $1M–$10M, FY2025
Government funding LOS ANGELES ARBORETUM FOUNDATION INC receives
Grants and contracts to this organization from federal (USASpending) and state checkbooks, reconciled to its EIN. $40k on record.
- National Endowment for the Arts$40k
Federal grants vs contracts are distinguished; state line items keep their reported category. Matched by name + geography (the BMF), so coverage is partial and precision-first.
Organizations like LOS ANGELES ARBORETUM FOUNDATION INC
Organizations whose mission and program text most resemble this one, by semantic similarity over every organization in the US filings — the closest peers, and often the clearest route to shared or prospective funders.
In California
Nationally
Read directly from this organization’s own Form 990, as neutral context.
Where the money goes
41% of spending goes to programs.
Governance
Public support
83%
Share of support from the public (Schedule A) — the basis for its public-charity status.
Footprint & structure
Files a return copy in 1 state
Screen this organization
A dated, signed PDF of the compliance screen for LOS ANGELES ARBORETUM FOUNDATION INC: IRS status (Business Master File, Publication 78, auto-revocation), the OFAC sanctions lists, the Internal Revenue Bulletin, and California registration, with the Rev. Proc. 2018-32 §8.01 reliance elements stated element by element. Generated from the current files at the moment you download it.
Screens are triage, not determinations; a source that cannot be read reports not screened, never clear. Screen this nonprofit · How the screen works · on the API as GET /api/screening/{ein}?format=pdf
Questions and answers
- Who funds LOS ANGELES ARBORETUM FOUNDATION INC?
- LOS ANGELES ARBORETUM FOUNDATION INC (California) receives grants from 46 organizations whose IRS filings report $4,596,378 to it, the largest being VANGUARD CHARITABLE ENDOWMENT PROGRAM ($550,000). 29 of them have funded it in more than one year.
- How many funders does LOS ANGELES ARBORETUM FOUNDATION INC have?
- IRS filings report 46 organizations giving $4,596,378 in grants to LOS ANGELES ARBORETUM FOUNDATION INC, 29 of which have funded it in more than one year.
- Who is the largest funder of LOS ANGELES ARBORETUM FOUNDATION INC?
- VANGUARD CHARITABLE ENDOWMENT PROGRAM is the largest funder on record, with $550,000 in grants. The full list of funders is on this page.
- How can an organization like LOS ANGELES ARBORETUM FOUNDATION INC find more funders?
- Start with the funders already giving here, then look at the foundations that back similar organizations in California. The funding by cause and by state pages list the largest funders for a given area and how to approach them.
Play a game about who funds Los Angeles Arboretum →
These figures are read directly from IRS Form 990 / 990-PF e-file XML: this organization’s own return for FY2025 (financials across 2017–2025), and the filings of 46 funders that report grants to it. “On record” means captured in the filings we have parsed — a funder that does not e-file, or whose grant detail is not itemized, will not appear. Filings run roughly 12–24 months behind. Trends on this page end at FY2023, the last fiscal year that has finished arriving; later years are shown and marked, and move no figure. Data on this page was exported October 14, 2026. What this page cannot tell you · view filing