Answer: You should wait until about mid-April, when the soil and air temperatures warm up. Be sure to harden off your plants before transplanting them into the ground. Do this by taking them outdoors to a sheltered spot for a few hours each day, for a few days. Then, if the weather is mild, let them "camp out" overnight. By the end of a week you should be able to plant them without a problem. They'll appreciate the extra attention and it will make the transition from warm environment to the great outdoors easier for them.
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