National Horticulture Associations

• American Society for Horticulture Science
• The Royal Horticultural Society
• North American Rock Garden Society

Local Retail Gardening Centers

• Paulino Gardens
• Echter's
• Tagawa Gardens
• City Floral

Denver Horticulture Associations

• Denver Botanic Gardens
• Plant Select
• Colorado State University Extension

Seeds and Soils

• Tomato Fest
• Seed Saver Exchange
• John Scheepers Kitchen Garden Seeds
• Annie's Heirloom Seeds
• Enchanting Sweet Peas​

Florists and Floral Designers

• The Twisted Tulip - Donald White
• ​Country Club Flower Shop

Online Gardening Centers

• High Country Gardens
• White Flower Farm
• High Country Roses
• David Austin Roses
• Brent and Becky's Bulbs
• Arrowhead Dahlias
• Peony's Envy
• Brushwood Nursery

Gardening Blogs

• Gardenista
• Far Out Flora
• Floret
• Horticulture Magazine
• In My Kitchen Garden
• Heirloom Gardener​