While each variety of collard may differ slightly in time to maturity and growing conditions, the following generally applies to all collard varieties.
The season for growing collard greens is typically from late spring to early fall. However, in warmer climates, collard can be grown year-round. Collards are usually started from seed or transplanted from an existing garden bed.
When growing collards, it is important to choose a sunny location with well-drained soil. Collards also prefer slightly acidic soil, so adding some compost or peat moss to the planting area can be helpful. Plants should be spaced about 18 inches apart, and water should be added regularly to keep the soil moist but not soggy.
On average, it takes between 65 and 70 days for collards to reach maturity (depending on variety). You can, however, start harvesting collards as soon as they’ve reached about 10 inches long and are dark-green in color.