Raised beds offer excellent drainage, warmer soil in spring, and complete control over soil quality—all advantages for cut flower growing. They are also the best solution for gardeners with poor native soil or limited space.
A 4x8-foot bed is the standard size: accessible from both sides, enough room for 3 rows of flowers. Depth of at least 12 inches is needed for most cut flowers; 18 inches is better for deep-rooted crops like sweet peas and larkspur.
Fill with a blend of topsoil (60%), compost (30%), and perlite or coarse sand (10%) for drainage. This provides the fertility and drainage most cut flowers want. See soil preparation for amendment details.
Raised beds dry out faster than in-ground beds. Drip irrigation on a timer is the most efficient solution. Mulch the surface with straw or shredded leaves to retain moisture.
Use intensive spacing (slightly closer than in-ground recommendations). Install support netting at planting time. Practice succession planting to keep the bed producing. Rotate cool-season and warm-season flowers through the same bed. See small-space guide for layout strategies.