When the seedlings of your broccoli and cauliflower have at least two sets of true leaves, transplant them. This should be completed around two weeks before to the final frost. Place them in full sun in a soil that is rich, wet, and well-drained, and space the young plants 18 to 24 inches apart in rows that are 212 to 3 feet apart.
How cold-resistant are broccoli plants?
Frost-Resistant – Some crops enhance in flavor when exposed to lower temperatures; root crops create more sugars when the soil temperature is below 40 degrees Fahrenheit; and Brussels sprouts are often at their peak after a light freeze. Cole crops, which can withstand mild winters (24-28°F), are among the hardiest vegetables: Broccoli; Cauliflower (26 degrees Fahrenheit); Chinese cabbage; Cabbage; Kale; Kohlrabi; Turnip.
Transplanting Broccoli Seedlings to Planting in the Garden
Better heads are produced in cooler summers, as high temperatures promote plants to go to seed early (see Recommended Varieties below).