American Rose Society

Edmunds' Roses

Florabunda Seeds

Hortico Nurseries

International Aroid Society

International Bulb Society

International Palm Society

Jung Seed Company

My Bonsai Tree

NatureServe

NC Wildflower Preservation Society

Nor'East Miniature Roses

Petaluma Rose Company

Regan Nursery

Royal Horticulture Society

San Gabriel Nursery & Florist

Seeds of Italy

Southeast Palm and Exotic Plant Society

Territorial Seed Company

The American Hemorocallis Society

The American Horticultural Society

The American Hosta Society

The Angelgrove Seed Company

The Cyclamen Society

The Garden Conservacy

The Hardy Fern Foundation

Your Backyard Garden

Vintage Gardens

Essential Garden Guide