| Texas Conservation FundHouston | Form 990-EZ | $87,690FY2024 |
| Gardening Volunteers of South TexasSan Antonio | Form 990-EZ | $87,684FY2025 |
| Bexar Audubon SocietySan Antonio | Form 990-EZ | $84,328FY2025 |
| Texas Vegetation Management Association Educational FoundationLa Grange | Form 990-EZ | $83,645FY2024 |
| Coastal Prairie Chaptr of the Texas Master Naturalists IncorporatedRosenberg | Form 990-EZ | $82,535FY2025 |
| Better Parks for GalvestonGalveston | Form 990-EZ | $82,062FY2024 |
| Caprock Partners FoundationQuitaque | Form 990 | $81,492FY2025 |
| Bandera Canyonlands AllianceVanderpool | Form 990-EZ | $81,378FY2025 |
| Independence GardensLewisville | Form 990-EZ | $80,242FY2025 |
| Community Garden Initiative of Central TexasAustin | Form 990-EZ | $76,724FY2025 |
| Frankford Preservation FoundationDallas | Form 990 | $74,644FY2024 |
| Global Effects IncorporatedFort Worth | Form 990-EZ | $74,464FY2025 |
| Citizens Environmental Coalition Educational FundHouston | Form 990-EZ | $72,476FY2024 |
| Austin OutsideAustin | Form 990-EZ | $72,073FY2025 |
| Friends of the River San BernardBrazoria | Form 990-EZ | $69,418FY2025 |
| Armand Bayou Nature Center FoundationPasadena | Form 990 | $69,272FY2025 |
| Clinic Access Support NetworkHouston | Form 990 | $67,649FY2025 |
| Allies in EnergyHouston | Form 990-EZ | $67,380FY2025 |
| Port Aransas Garden ClubPort Aransas | Form 990-EZ | $65,892FY2025 |
| Victoria County Master Gardener AssociationVictoria | Form 990-EZ | $65,382FY2025 |
| Preserve Our Hill Country Environment FoundationNew Braunfels | Form 990-EZ | $64,537FY2025 |
| Keystone Heritage Park IncEl Paso | Form 990 | $64,521FY2024 |
| Frontera Audubon SocietyWeslaco | Form 990-EZ | $64,313FY2025 |
| Matagorda County Nature Center IncBay City | Form 990-EZ | $64,115FY2025 |
| Keep Athens BeautifulAthens | Form 990-EZ | $64,017FY2025 |
| Lake McQueeney Property Owners Association IncMcQueeney | Form 990-EZ | $63,927FY2025 |
| Polk County Recycling and BeautificationLivingston | Form 990-EZ | $61,345FY2024 |
| HSB Park IncHorseshoe Bay | Form 990 | $60,737FY2025 |
| Moss Haven FarmDallas | Form 990-EZ | $59,054FY2023 |
| Fort Bend County Master Gardeners IncRosenberg | Form 990-EZ | $58,729FY2024 |
| Keep Irving BeautifulIrving | Form 990-EZ | $57,630FY2025 |
| White Rock East Garden Tour and ArtisansDallas | Form 990-EZ | $56,112FY2025 |
| Protect the Paluxy Valley IncGlen Rose | Form 990-EZ | $55,311FY2025 |
| Harris County Master Gardener Association IncHouston | Form 990-EZ | $54,907FY2025 |
| Rockwall County Master Gardener Association IncRockwall | Form 990-EZ | $52,823FY2025 |
| Pines and Prairies Land TrustBastrop | Form 990 | $52,716FY2023 |
| Quail Valley Garden Club IncMissouri City | Form 990-EZ | $51,450FY2025 |
| Chautauqua Foundation IncAustin | Form 990-EZ | $51,340FY2025 |
| Keep Wimberley Beautiful IncWimberley | Form 990-EZ | $50,971FY2026 |
| Justice and Mercy Services IncRobinson | Form 990-EZ | $50,372FY2024 |
| Watson Rare Native Plant PreserveWarren | Form 990-EZ | $50,074FY2025 |
| Friends of Hutto Dog ParkHutto | Form 990-EZ | $50,007FY2024 |
| Southeast Section of the Water Environment Association of TexasHouston | Form 990-EZ | $49,596FY2025 |
| Mitigation Futures ConservancyMcKinney | Form 990-N | No figure |
| Friends of the ArboretumQuitman | Form 990-EZ | $45,957FY2025 |
| Texas Garden Clubs IncFriendswood | Form 990-N | No figure |
| Brazoria County Master Gardener AssociationAngleton | Form 990-EZ | $43,650FY2025 |
| San Marcos Greenbelt AllianceSan Marcos | Form 990-N | No figure |
| Herb Society of America Pioneer UnitRound Top | Form 990-EZ | $42,167FY2025 |
| Krushan FoundationWimberley | Form 990-N | No figure |