| PENNSYLVANIA HORTICULTURAL SOCIETY | $40,908,442 | C42 | published | | Philadelphia, PA | 2024 |
| WEST MICHIGAN HORTICULTURAL SOCIETY INC | $38,055,994 | C42 | published | | Grand Rapids, MI | 2024 |
| CHARLES K KING NO 3 TRUST | $21,859,657 | C42 | inferred 0.70 | | Brooklyn, OH | 2024 |
| DUKE FARMS FOUNDATION | $16,859,159 | C42 | published | science: research education | Hillsborough, NJ | 2024 |
| FAIRCHILD TROPICAL BOTANIC GARDEN | $14,464,407 | C42 | published | space: outer | Miami, FL | 2024 |
| HORTICULTURAL SOCIETY OF NEW YORK INC | $14,139,081 | C42 | published | | New York, NY | 2024 |
| URBAN TILTH | $13,837,802 | C42 | published | science: research education | Richmond, CA | 2024 |
| YOUNG WOMENS CHRISTIAN ASSOCIATION | $13,449,078 | C42 | published | domestic violence | Hanover, PA | 2024 |
| JAPANESE GARDEN SOCIETY OF OREGON | $13,121,084 | C42 | published | | Portland, OR | 2024 |
| WASHINGTON TRAILS ASSOCIATION | $10,815,626 | C42 | inferred 0.60 | launch: launch | Seattle, WA | 2025 |
| YERBA BUENA GARDENS CONSERVANCY | $10,060,079 | C42 | published | | San Francisco, CA | 2024 |
| TEXAS TREES FOUNDATION | $9,216,183 | C42 | inferred 0.60 | | Dallas, TX | 2025 |
| WORCESTER COUNTY HORTICULTURAL SOCIETY | $8,680,272 | C42 | published | science: research education | Boylston, MA | 2024 |
| VENTURA BOTANICAL GARDENS INC | $8,656,488 | C42 | published | | Ventura, CA | 2025 |
| THE GARDEN CLUB OF AMERICA | $7,369,737 | C42 | published | | New York, NY | 2024 |
| PLANTING JUSTICE | $6,005,233 | C42 | published | violence: gun | Oakland, CA | 2024 |
| VIRGINIA AQUARIUM & MARINE SCIENCE CENTER FOUNDATION INC | $5,923,775 | C42 | inferred 0.60 | science: research education | Virginia Bch, VA | 2024 |
| NATIVE PLANT TRUST INC | $4,823,300 | C42 | published | girls boys: girl scouts | Wayland, MA | 2024 |
| BOSTON FOOD FOREST COALITION | $4,637,715 | C42 | inferred 0.80 | | Jamaica Plain, MA | 2024 |
| THE PARK PEOPLE | $3,750,843 | C42 | inferred 0.80 | | Denver, CO | 2024 |
| AMERICAN HORTICULTURAL SOCIETY INC | $3,389,584 | C42 | published | | Alexandria, VA | 2024 |
| RHODODENDRON SPECIES FOUNDATION | $3,037,683 | C42 | published | | Federal Way, WA | 2024 |
| BOTANICAL SOCIETY OF AMERICA INC | $2,522,027 | C42 | published | science: research education | Saint Louis, MO | 2024 |
| GROWING GARDENS | $2,467,025 | C42 | published | shelter: homeless | Boulder, CO | 2025 |
| MINNESOTA NURSERY & LANDSCAPE ASSO | $2,401,925 | C42 | inferred 0.60 | | Roseville, MN | 2024 |
| URBAN HARVEST INC | $2,382,221 | C42 | published | women: issues | Houston, TX | 2025 |
| FOODWISE COMMUNITY | $2,125,073 | C42 | inferred 0.60 | | San Francisco, CA | 2024 |
| CHARLESTON PARKS CONSERVANCY | $2,111,425 | C42 | published | | Charleston, SC | 2025 |
| TEXAS DISCOVERY GARDENS | $2,023,393 | C42 | inferred 0.80 | science: research education | Dallas, TX | 2025 |
| GARDEN CLUB OF VIRGINIA INC | $1,886,878 | C42 | published | | Richmond, VA | 2024 |
| SONOMA BOTANICAL GARDEN | $1,722,303 | C42 | inferred 0.60 | | Glen Ellen, CA | 2023 |
| GORDON BUBOLZ NATURE PRESERVE INC | $1,676,875 | C42 | inferred 0.60 | | Appleton, WI | 2024 |
| AMERICAN ORCHID SOCIETY INC BOTANICAL MUSEUM OF HARVARD UNIV | $1,592,002 | C42 | published | science: research education | Coral Gables, FL | 2024 |
| WESTERN CHAPTER INTERNATIONAL SOCIETY OF ARBORICULTURE | $1,439,102 | C42 | inferred 0.60 | | Porterville, CA | 2024 |
| NEIGHBORHOOD GARDENS TRUST | $1,436,407 | C42 | published | | Philadelphia, PA | 2024 |
| REAL ORGANIC PROJECT INC | $1,436,030 | C42 | published | | East Thetford, VT | 2024 |
| American Nursery & Landscape Assn | $1,378,736 | C42 | inferred 0.70 | | Washington, DC | 2013 |
| AMERICAN HEMEROCALLIS SOCIETY | $1,314,441 | C42 | published | science: research education | Osseo, MN | 2024 |
| JUPITER ISLAND GARDEN CLUB INC | $1,290,405 | C42 | published | | Hobe Sound, FL | 2024 |
| FLORIDA NATIVE PLANT SOCIETY INC | $1,166,778 | C42 | published | | Gainesville, FL | 2025 |
| AMERICAN ROSE SOCIETY | $1,161,086 | C42 | published | | Shreveport, LA | 2024 |
| MOUNTAIN TOP ARBORETUM INC | $1,053,830 | C42 | inferred 0.60 | | Tannersville, NY | 2025 |
| CITYSPROUTS INC | $1,051,544 | C42 | published | science: research education | Cambridge, MA | 2024 |
| GREEN HEART PROJECT INC | $982,901 | C42 | published | science: research education | Charleston, SC | 2024 |
| AMERICAN RHODODENDRON SOCIETY | $900,203 | C42 | published | | Portland, OR | 2024 |
| RIVER OAKS GARDEN CLUB | $899,674 | C42 | published | | Houston, TX | 2024 |
| MINNESOTA STATE HORTICULTURAL SOCIETY | $897,475 | C42 | published | | Roseville, MN | 2024 |
| FORT WORTH GARDEN CLUB INC | $892,222 | C42 | published | | Fort Worth, TX | 2025 |
| AMERICAN CAMELLIA SOCIETY TRUST INC | $877,838 | C42 | published | | Fort Valley, GA | 2024 |
| TUCSON GEM AND MINERAL SOCIETY INC | $875,533 | C42 | inferred 0.60 | | Tucson, AZ | 2024 |
| LESLIE J NICKELS TESTAMENTARY TRUST | $857,984 | C42 | inferred 0.60 | science: research education | Colusa, CA | 2024 |
| VINE CORPS INC | $844,153 | C42 | published | | Cheverly, MD | 2024 |
| KLAMATH SISKIYOU WILDLANDS CENTER | $841,049 | C42 | published | | Ashland, OR | 2024 |
| GARDEN CLUB OF HOUSTON | $839,305 | C42 | published | | Houston, TX | 2024 |
| GREENWICH BOTANICAL CENTER INC | $820,650 | C42 | published | | Cos Cob, CT | 2024 |
| SEED SAINT LOUIS | $811,737 | C42 | published | | Saint Louis, MO | 2024 |
| URBAN OASIS PROJECT INC | $803,715 | C42 | published | | Miami, FL | 2024 |
| PROJECT EVERGREEN FOUNDATION INC | $782,923 | C42 | inferred 0.60 | | Mentor, OH | 2024 |
| SOUTH ALABAMA BOTANICAL AND HORTICULTURAL SOCIETY | $772,761 | C42 | published | | Mobile, AL | 2024 |
| KLEHM ARBORETUM AND BOTANIC GARDEN INC | $750,971 | C42 | published | | Rockford, IL | 2024 |
| BOTANICAL GARDEN SOCIETY OF NORTHWEST MICHIGAN INC | $745,181 | C42 | published | | Traverse City, MI | 2024 |
| GARDEN CLUB OF PALM BEACH | $743,727 | C42 | published | | Palm Beach, FL | 2024 |
| STATE HORTICCULTURAL ASSOCIATION OF PENNSYLVANIA | $743,294 | C42 | inferred 0.60 | | York Springs, PA | 2024 |
| CACTUS & SUCCULENT SOCIETY OF AMERICA INC | $739,689 | C42 | published | | Pasadena, CA | 2025 |
| INTERNATIONAL PALM SOCIETY INC | $729,027 | C42 | published | science: research education | Austin, TX | 2025 |
| URBAN FARMING EDUCATION | $718,656 | C42 | published | | Phoenix, AZ | 2025 |
| RUSTIC ROOTS SANCTUARY CO | $700,216 | C42 | published | | Saint Louis, MO | 2024 |
| National Gardening Association Inc | $672,191 | C42 | inferred 0.60 | | Williston, VT | 2015 |
| NEW VARIETIES DEVELOPMENT&MANAGEMEN T CORP | $632,022 | C42 | published | | Maitland, FL | 2024 |
| GROWTORAH INC | $631,868 | C42 | published | | Teaneck, NJ | 2024 |
| ILLINOIS ARBORISTS ASSOCIATION INC USDA FOREST SERVICE | $621,786 | C42 | inferred 0.60 | | Antioch, IL | 2025 |
| COMMON GROUND COMMUNITY INC | $583,074 | C42 | published | | Shreveport, LA | 2025 |
| AMERICAN CAMELLIA SOCIETY | $580,225 | C42 | published | | Fort Valley, GA | 2024 |
| NORTH AMERICAN ROCK GARDEN SOCIETY INC | $572,501 | C42 | published | | Raleigh, NC | 2025 |
| GARDEN CLUB OF JACKSONVILLE | $549,721 | C42 | published | | Jacksonville, FL | 2024 |
| EDMUND NILES HUYCK PRESERVE INC | $543,090 | C42 | inferred 0.60 | science: research education | Rensselaervle, NY | 2024 |
| HYSLOP FOUNDATION INC | $537,304 | C42 | inferred 0.60 | | Kenosha, WI | 2024 |
| BOUNTIFUL CITIES PROJECT | $529,623 | C42 | published | science: research education | Asheville, NC | 2024 |
| FRIENDSHIP GARDEN FOUNDATION | $523,269 | C42 | inferred 0.50 | girls boys: boy scouts | Honolulu, HI | 2025 |
| THE NASHVILLE TREE FOUNDATION | $486,766 | C42 | inferred 0.60 | | Nashville, TN | 2024 |
| SOCIAL BRIDGE | $482,665 | C42 | published | | Glenwood Spgs, CO | 2024 |
| WILLIAMS FAMILY FOUNDATION | $476,218 | C42 | published | | Nashville, TN | 2025 |
| OAKLAND EAST BAY GARDEN CENTER INC | $475,507 | C42 | inferred 0.90 | | Oakland, CA | 2024 |
| FRONTRANGE EARTH FORCE | $451,446 | C42 | inferred 0.60 | | Denver, CO | 2009 |
| GROWERS FIRST INC | $450,480 | C42 | published | | Laguna Beach, CA | 2024 |
| HERB SOCIETY OF AMERICA INC | $443,811 | C42 | published | science: research education | Kirtland, OH | 2024 |
| SANTA ROSA GARDEN CLUB | $443,129 | C42 | published | | Santa Rosa, CA | 2021 |
| HARDY PLANT SOCIETY OF OREGON | $434,524 | C42 | published | | Portland, OR | 2024 |
| FOUNDATION FOR AGRICULTURAL & RURAL RESOURCES MNGMNT & SUSTAINABILITY | $427,888 | C42 | published | | Minot, ND | 2024 |
| FRIENDS OF FELLOWS RIVERSIDE GARDENS INC | $394,448 | C42 | inferred 0.80 | | Youngstown, OH | 2025 |
| FROGTOWN GARDENS | $389,929 | C42 | published | | Saint Paul, MN | 2025 |
| WILL ERWIN HEADACHE RESEARCH FOUNDATION | $382,577 | C42 | published | | Houston, TX | 2024 |
| PLANTABLE INC | $382,195 | C42 | published | | Redding, CA | 2025 |
| PORTLAND GARDEN CLUB | $378,974 | C42 | published | | Portland, OR | 2024 |
| CITY GARDENS CLUB OF NEW YORK CITY INCORPORATED | $377,331 | C42 | published | | New York, NY | 2024 |
| SHIN ZEN FRIENDSHIP GARDEN INC | $371,305 | C42 | inferred 0.60 | | Fresno, CA | 2025 |
| BLACK THUMB FARM | $368,037 | C42 | published | | Porter Ranch, CA | 2024 |
| CALIFORNIA GARDEN CLUBS INC | $366,058 | C42 | inferred 0.85 | | Long Beach, CA | 2025 |
| LAKE FOREST GARDEN CLUB | $365,951 | C42 | published | science: research education | Lake Forest, IL | 2024 |
| SAN GABRIEL VALLEY CACTUS AND SUCCULENT SOCIETY | $362,267 | C42 | published | | Arcadia, CA | 2025 |