ISHS Affiliates
- Des Moines Botanical Center
- Federated Garden Clubs of Iowa
- Iowa Arboretum and Gardens
- Iowa Arborists Association
- Iowa Bonsai Association
- Iowa Christmas Tree Association
- Iowa Golf Course Superintendents Association
- Iowa Honey Producers Association
- Iowa Master Gardener
- Iowa Nursery & Landscape Association
- Iowa Nut Growers Association
- Iowa Professional Lawn Care Association
- Iowa Regional Lily Society
- Iowa Specialty Crop Growers Association
- Iowa Sports Field Managers Association
- Iowa State University Horticulture Club
- Iowa Turfgrass Institute
- Iowa Wine Growers Association
- Iowa Woodlands Owners Association
- Reiman Gardens of Iowa State University