When to plant: Sow seeds up to two months before the last frost
date in spring, then continue sowing every three weeks until just past the last frost date. In fall, sow seeds a month to six weeks before the first frost date; continue through winter in mild-winter climates.
Days to maturity: 40 to 150
Light requirement: Full sun to light shade, especially if afternoons will be somewhat hot
Water requirement: Provide consistent water but don’t overwater
Favorites: Bloomsdale Longstanding, Indian Summer, Marathon, Oriental Giant, Red
Cardinal, Space, Tyee
Planting and care: Soil should be well drained and well amended. Sow seeds a half inch deep and an inch apart. Thin to 3 to 4 inches apart when seedlings appear (the best and most nutritious way to thin is to pick off the leaves and eat them). Set transplants to this spacing as well. Keep the soil continuously most but not overly wet, and be sure to weed carefully around the plants. Aphids,
cabbage worms and leaf miners are the most troublesome pests.
Harvest: Either pick off leaves as you need them or harvest the entire plant. If you need the entire plant but don’t want to pull it out, cut off all leaves about an inch above the soil; the plant will regrow.
More: How to Grow Cool-Season Vegetables