Dahlias are perennial flowering plants native to Mexico and Central and South America. There is a variety and size of dahlia for every garden, from huge 12-inch flower heads to 2-inch mini-blooms in a rainbow of colors. Plant dahlia tubers from mid-April to the end of May when the soil temperature warms to at least 60 degrees.
Choose a sunny location in which to plant the dahlia bulb or tuber. The plant requires eight hours of sun per day, unless you live in a particularly hot region, in which case choose a location that receives shade in the afternoon.
Amend the soil if in the planting bed. Add 3 inches of sand or peat moss if you have clay soil and use the garden fork or a hoe to mix it to a depth of 6 inches. Otherwise, add 3 inches of well-rotted manure and mix it in well.
Dig planting holes, 4 to 6 inches deep and 18 to 24 inches apart.
Place the dahlia bulbs into the planting holes with the "eye" facing up. The eye is easy to locate when looking at the tuber. Cover the bulbs with soil.
Place slug and snail bait around the planting bed. Reapply two weeks after the dahlias sprout.
Water the bed only after the bulbs have sprouted and then water them two to three times per week. A sprinkler left on for half an hour is sufficient.