Answer: The answer is really one of it depends. The best way to determine whether or not to move them to larger pots is by looking at the plants; if their root systems are crowding through the soil or if the plants are wilting because it is difficult to keep them watered enough then they need larger pots. This will depend on how early you start them, how well you care for them, what varieties you are growing and what plants you are starting. (Squash for instance grow very fast and need only a few weeks head start.) Keep in mind that it is better to move them to larger pots than to risk checking their growth and possibly stunting them.
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