Answer: Actually, your cabbage should be mature in a matter of 8 or 9 weeks. If you want some for your fall plantings, start another batch of seeds in mid-August. They'll enjoy the cooler temperatures of fall, too.
When your current seedlings have their second set of true leaves, transplant them to individual peat pots for a few weeks, and then pop them into your garden. I'm not sure how they'll do in the humid heat of a Virginia summer, but they'll probably do better in a place that gets partial shade. Good luck!
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