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Dahlias are known for havingDahlias are known for having a long blooming season. Each dahlia tuber will produce many blooms. After one flower is spent, be sure to deadhead the spent bloom which will encourage more flowering. Once established, dahlias like a deep watering 2 or 3 times a week with a soaker hose. You should add a nitrogen-soluble fertilizer every few weeks. In terms of hot weather: It's can make them limp along, but adding mulch and misting the plants can help them get through it. If you live in a warm place, buying heat-tolerant varieties is also a good idea!