Answer: As long as you drill or punch lots of drainage holes in the buckets, they will be just fine for blueberries. Here are some guidelines:
Your containers should be big enough to contain the root system of the bush, and provide some room to grow. For smaller bushes, a 2 gallon container will be fine; for larger plants, upgrade to a much larger container, such as a 5 gallon bucket.
A mixture of high-acid potting soil and peat moss is a good start for blueberry plants. Add a bit of granular sulfur and organic compost to the mix, and you're ready to plant.
Fill the container with a layer of packed soil mixture. Add your blueberry bush and continue adding the soil until the pot is full. Make sure the entire root system is covered.
Check your plants often to make sure the soil hasn't dried out, and water as needed.
Place your potted blueberry bushes in a sunny location, or move them around in your garden to maximize sun exposure.
Best wishes with your blueberry plants.
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