General Plant CareDahlias like to be planted in slightly acidic soil (6.3 to 6.8). Well drained soil is a must, as dahlias can rot if the soil holds too much moisture. Plant in a sunny spot, some light afternoon shade should be ok. If it is a taller variety, staking is recommended at the time you plant your tuber. Water deeply once a week - in very hot weather, watering more often would be required. Fertilize with a 5-10-10 or 10-20-20 fertilizer as too much nitrogen will result in a big plant, with no flowers. I used an organic seaweed fertilizer, that I mixed with water and sprayed on the dahlias for the 2015 season and it seemed to work great.
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