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Because I have such a short growing season here in Rhode Island, I'm starting my tubers in pots indoors this year. I've planted them in 3 inch pots with 1/4 inch of potting soil covering the eyes, and was advised not to water them at all until they grow stems. Is a 3 x 3.5 inch inch pot too small? I was told it's fine but am still skeptical, as they have 4 more weeks to grow before I plant them in the garden. The potting soil was moist but is already bone dry. Should I water them a bit?