Answer: Some of the smaller, or border, dahlias will grow well in pots, but you may have a real challenge on your hands in trying to grow full sized dahlias in pots. These plants can produce a jungle of foliage, which generally requires staking for support. The tubers should be buried about 12" below the soil surface. To accommodate these plants, plan on using a five-gallon bucket per plant, filling it with garden soil amended with organic matter, placing two 6' tall stakes in each bucket, and then planting the tuber.
Make sure there are plenty of drainage holes in the bottoms of your containers, and check the plants every 3-4 days to make sure the soil hasn't dried out.
Hope you're successful with your containerized dahlia garden!
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