How to Grow Brunswick Cabbage WHEN TO PLANT CABBAGE SEEDS Cabbage seeds should be started inside around 6-8 weeks before the last frost in the Spring. Harden them off and then transplant them outside 2-3 weeks before your last expected frost. WHERE TO PLANT CABBAGE SEEDS Choose an area in your garden that gets at least 6 hours of sunlight. The soil should be well-draining with a pH balance of 6.5 - 6.8. HOW TO PLANT CABBAGE SEEDS Plant seeds 1/2" deep in your soil. Space out your plants about 12", enough to give them room to grow. If transplanting, space your plants about 24 inches apart for larger heads, or closer for smaller heads.
