Although growing dahlias in very hot areas can be a challenge, some people have had success. Be sure that your dahlias are one of those varieties that are more heat tolerant. As you have, choose a site that is out of direct sun for part of the day, and be sure the soil is well-drained and rich. Shade during periods of high heat. Provide thick mulch (about 2 to 4 inches) to protect the roots. Mist during the day, to keep up the humidity, and water regularly. (The soil should be moist but not waterlogged.) Some gardeners in Zone 9 and warmer areas do not dig up the tubers except for about every 2 to 3 years to divide them. To overwinter in the ground, cut the stalks back to about 1 inch. (Some people place plastic or tin foil over the stalks to help prevent rot.) Then cover the stalks and tuber with about 6 inches of mulch. Water the area occasionally in winter, as needed, to prevent the tubers from drying. In spring, remove the plastic/tin foil covering (if using), and most of the mulch.
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