How Deep to Plant Dahlia Bulbs

Propagation

• Dahlias are propagated from seeds, cuttings or tuberous roots, depending on the type of dahlia, but they are commonly grown from tubers. Plant dahlia roots that have one live bud or eye, which is in the crown area. Divide the roots at that location with a sharp knife or pruning shears.

Planting Depth

• Plant dahlias in holes 8 to 10 inches deep and wide enough to accommodate the roots. Loosen soil at the bottom of the hole and refill it to a depth of 6 inches. Place the tuberous root on its side, with the eye facing upward, and cover with 2 to 3 inches of soil. Fill in soil around each plant as it grows, until the surface is level.

Planting Location

• Dahlias require a minimum of five to six hours of sunlight daily and well-draining soil. Because dahlias are heavy feeders, spade the bed to a depth of as much as 8 to 10 inches before planting. Work in comport or manure for a slow release of nitrogen. Also work in 5-10-15 or 5-10-10 fertilizer. If soil tests indicate low pH, add ground limestone.