Growing dahlias from seed is another way to grow dahlias. I saved seed from my formal decorative and informal decorative dahlias last fall. I usually start my dahlia seed around 4 to Amazon.com : Vegetable Seeds for Planting 10 Variety Pack Heirloom Garden Seed Packs to Grow Tomato, Lettuce, Onion, Cucumber, Squash & Other Vegetables Non GMO Family Garden Kit Survival Garden Frangipani Samen How Much and How Often to Water Succulents Retro Den Vintage Furniture and Homewares Deer Resistant Wildflower Seed Mix