Dahlias range drastically in size and appearance. They grow 1 to 6 feet high, producing flowers anywhere from 2 to 12 inches in diameter in red, yellow, orange, pink, purple and white. Some flowers have stripes and some are all one color, while others are tipped with a different color. Planting these flowers in a mass provides an attractive and varied flower bed for your garden.
Apply 2 to 4 inches of organic compost to the soil in a planting area with full sun and well-draining, slightly acidic, sandy loam soil. Mix it in to the soil to a depth of 6 to 8 inches. Mix in 2 tbsp. fertilizer marked 8-8-8 for every square foot of land.
Dig a large hole, 8 to 10 inches deep and wide enough to incorporate all the dahlia tubers. Space large dahlias 3 to 4 feet apart and small dahlias 2 feet apart. Place a stake in each spot where you will plant a flower tuber. The stakes will support the flowers as they grow .
Refill 6 inches of soil into the hole. This will provide loosened soil for the roots to break through. Lay the tubers down 3 to 4 inches from the stakes with the eyes facing upwards
Add the rest of the soil into the hole and tamp down firmly. Water deeply to settle the soil and eliminate any air bubbles.