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Wildlife · Plants and Research

National Tropical Botanical Garden

“Enrich life through discovery, scientific research, conservation, and education.”

62 years on the ground, 83 cents of every dollar to the work.

Home groundKalaheo, HI
Founded1964
Tax status501(c)(3)
Led byJanet L Mayfield
Find themntbg.org ↗

Give to them ↗Every way to help ↓

The work

What they do

Congressionally chartered botanical garden focused on tropical plant conservation. Works with federal agencies on rare plant recovery on federal lands in Hawaii and Florida.

Where the money went, FY2024

The work, and what it cost

Living Collections

$5.8M, 40% of spending

NTBGs gardens & preserves are safe havens for at-risk species that otherwise might disappear forever. 140 acres are formally maintained.

Read it as they filed it
LIVING COLLECTIONS: NTBGS GARDENS & PRESERVES ARE SAFE HAVENS FOR AT-RISK SPECIES THAT OTHERWISE MIGHT DISAPPEAR FOREVER. 140 ACRES ARE FORMALLY MAINTAINED. NTBGS COLLECTIONS ENCOMPASS 127K LIVING PLANTS, REPRESENTING 3,133 SPECIES AND 3,726 DISTINCT TAXA. THE STAFF AT NTBGS HORTICULTUAL CENTER & NURSERIES GROW AND SAFEGUARD RARE & ENDANGERED PLANTS FROM HAWAII & OTHER PACIFIC ISLANDS. MANY SPECIES THAT ARE ALMOST EXTINCT IN NATURE HAVE BEEN REINTRODUCED TO THEIR HABITAT BY NTBGS BOTANISTS. NTBGS COLLECTIONS ARE STUDIED BY VISITING SCHOLARS, RESERCHERS & STUDENTS FROM AROUND THE WORLD. NTBGS GARDEN IN FLORIDA, THE KAMPONG, IS THE FORMER ESTATE OF DR. DAVID FAIRCHILD, THE FAMED BOTANICAL EXPLORER. OUR GARDEN IN MAUI, KAHANU GARDEN, IS HOME TO THE PIILANIHALE HEIAU, BELIEVED TO BE THE LARGEST ANCIENT MAN-MADE STRUCTURE IN POLYNESIA.

IRS Form 990 Part III, fiscal year 2024, signed under penalty of perjury.

Science & Conservation

$3.1M, 22% of spending

This program is focused on protecting & conserving tropical plants. Our field botanists survey many areas in Hawaii to assess threats to Native species & collect seeds & cuttings for propogation, & are either…

Read it as they filed it
SCIENCE & CONSERVATION: THIS PROGRAM IS FOCUSED ON PROTECTING & CONSERVING TROPICAL PLANTS. OUR FIELD BOTANISTS SURVEY MANY AREAS IN HAWAII TO ASSESS THREATS TO NATIVE SPECIES & COLLECT SEEDS & CUTTINGS FOR PROPOGATION, & ARE EITHER OUTPLANTED,PRESERVED IN THE HERBARIUM OR PLACED IN SEED STORAGE. NTBGS SEED BANK CONTAINS MORE THAN 18.5 MILLION SEEDS OF MORE THAN 943 TAXA. THE BOTANICAL RESEARCH CENTER IS THE HOME FOR THE GARDENS HERBARIUM, SEED BANK & A RARE BOOK LIBRARY THAT IS TEMPERATURE & HUMIDITY CONTROLLED & HOLDS OVER 1,200 VOLUMES OF BOOKS-SOME THAT DATE BACK TO THE 1500S. THESE COLLECTIONS ARE CRUCIAL FOR OUR RESEARCH, PUBLICATIONS AND EDUCATIONAL PROGRAMS. THE GARDENS BREADFRUIT INSTITUTE MANAGES THE LARGEST & MOST DIVERSE COLLECTION OF BREADFRUIT SPECIES & VARIETIES IN THE WORLD, WITH OVER 120 VARIETIES CONSERVED IN FIELD GENE BANKS. THE INSTITUTE PROMOTES THE CONSERVATION & USE OF BREADFRUIT FOR FOOD SECURITY, AGRICULTURAL SUSTAINABILITY & ECONOMIC DEVELOPMENT. NTBG IS ALSO A COLLABORATIVE PARTNER WITH FIU IN THE DEVELOPMENT OF THE INTERNATIONAL CENTER FOR TROPICAL BOTANY IN FLORIDA. THE CENTER IS DESIGNED TO EDUCATE & BRING TOGETHER BOTANISTS FROM AROUND THE WORLD TO SHARE KNOWLEDGE.

IRS Form 990 Part III, fiscal year 2024, signed under penalty of perjury.

Education

$3.1M, 22% of spending

NTBG believes that education is key for preservation of tropical plants & ecosystems.

Including $37,000 granted onward, the largest share ($7,000) to Florida International University.

Read it as they filed it
EDUCATION: NTBG BELIEVES THAT EDUCATION IS KEY FOR PRESERVATION OF TROPICAL PLANTS & ECOSYSTEMS. TOURS ARE OFFERED THROUGH ITS GARDENS TO EDUCATE THE GENERAL PUBLIC ABOUT THE NEED TO PRESERVE TROPICAL FORESTS RICH WITH NATIVE BIODIVERSITY AND TO PROTECT OUR ECOSYSTEMS & RESOURCES THAT WE RELY ON FOR OUR OWN WELL-BEING. IN 2024, OUR BOTANICAL GARDENS HAD 110,379 VISITORS FROM AROUND THE WORLD. OTHER EDUCATIONAL ACTIVITIES INCLUDE FORMAL AND INFORMAL LECTURES, BOTANICAL ILLUSTRATOR COURSES, INTERNSHIPS & WORKSHOPS FOR COLLEGE PROFESSORS, HIGH SCHOOL TEACHERS & ENVIRONMENTAL JOURNALISTS. SCIENCE STAFF REGULARLY PROVIDE ARTICLES IN SCIENTIFIC PUBLICATIONS. THE SCIENCE STAFF HAVE COLLABORATED ON & PUBLISHED SEVERAL BOOKS ON TROPICAL FLORA. THE LOY MCCANDLESS MARKS BOTANICAL LIBRARY CURRENTLY HOLDS OVER 20,000 VOLUMES, 3,000 ORIGINAL BOTANICAL ARTWORKS & PRINTS, 6,000 PHOTOGRAPHS & 16,000 COLOR SLIDES. THE LIBRARY COMPRISES ONE OF THE FINEST COLLECTIONS OF TROPICAL BOTANICAL & HORTICULTURAL REFERENCE COLLECTIONS IN THE PACIFIC BASIN. THE KAMPONG, IN COCONUT GROVE, FL IS HOME TO THE FORMER RESIDENCE OF DR. DAVID FAIRCHILD, AN AMERICAN BOTANIST WHO WAS RESPONSIBLE FOR THE INTRODUCTION OF MORE THAN 200,000 EXOTIC PLANTS & CROPS IN THE U.S.

IRS Form 990 Part III, fiscal year 2024, signed under penalty of perjury.

Follow the dollar

83 cents of every dollar goes to the work

83¢
83¢ the work12¢ keeping the lights on5¢ raising the next dollar

A good sign, not a scorecard: what matters is the extremes, and this is nowhere near one.

$11,981,291 programs, $1,689,125 management, $747,127 fundraising. Form 990, FY2024.

The people

Who does the work

171paid staff
444volunteers last year
25board members
Janet L MayfieldCEO & DirectorComp $173,319, FY2024
Tamara a RollinsCFOComp $130,590, FY2024
Gordon L DeaneBoard ChairVolunteer, 2 hrs a week, $0

Chairs the 25-member board.

Honesty note: leadership comes from each year’s federal filing, so it can run a year behind. If it’s out of date, tell us. Work at NTBG? Claim this page.

Those 444 volunteers are people who decided this ground was theirs to defend. If NTBG is fighting for your place too, the matchmaker will find your way in.

Find your way in

The filings

14 years of filings

Total revenue by fiscal year, as filed. Point at or tap the line for any year.

$10M$20M$30M$29.2M FY2420112024
Total revenue by fiscal year
YearRevenue
2011$8,983,457
2012$10,995,883
2013$9,196,998
2014$12,141,771
2015$16,306,843
2016$9,434,646
2017$10,640,833
2018$11,323,064
2019$11,652,622
2020$8,583,887
2021$14,124,029
2022$15,141,654
2023$12,932,790
2024$29,167,793

From $9.0M in 2011 to $29.2M in FY24, with no missed filing in 14 years. FY24 is the highest year on file.

Their ground

NTBG is not on our editors’ record for a threatened place yet. See every threatened place on one map, and who stands for each.

Where and what
Federal landsFish & Wildlife Service · National Park Service
Active inHawaii · Florida
The family, on the record

National Tropical Botanical Garden files one related organization on its return: John T Waterhouse Trust (501(c)(3)). A related organization shares people or purpose; it does not share the books.

Who writes the rules where they work

The Hawaii congressional delegation averages 99 of 100 on public lands. See the full scorecard

The Florida congressional delegation averages 29 of 100 on public lands. See the full scorecard

More groups in Hawaii

Ways in

How to help

Stand with National Tropical Botanical Garden

The mission is theirs. The backing is yours.

Sources and methodFinancials, headcounts, and program text: IRS Form 990, FY2024 and 13 prior filings via ProPublica Nonprofit Explorer, EIN 52-6057064. Leadership and compensation: Form 990 Part VII and the return’s signature block, FY2024 filing. Grantees: Schedule I, same filing. Related organizations: Schedule R of the same filing, matched to our directory by EIN. Org-reported figures are always labeled. Data verified as of 2026-09-23. Nothing on this page is pay-to-play.