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 20 Brilliant Vertical Garden Ideas Interesting Vertical Garden Planters Heavy Hitter Okra Costume Trilly E Peter Pan Costume Carnevale Trilly E Peter Pan Costume Carnevale Costume Growing Allium From Seed an Easy Guide Gardeners Basics Lilium Wild About Tiger Lily Mix