- Leaf, Cos and Butterhead lettuce can be planted anytime in the spring when the soil is dry enough to rake the surface.
- Two or more successive plantings at 10 to 14 day intervals provide a continuous supply of lettuce.
- Lettuce does not withstand hot summer days well and spring planting should be completed at least a month before the really hot days of early summer begin.
- Plantings started in late summer mature during cool fall weather.
- Watering is essential for seed germination and establishment of seedlings.
- Some shade may also benefit summer sowings.
- Heat-tolerant varieties (mainly loose-leaf types) may be grown in the shade of taller crops through most of the summer if extra care is taken about irrigation and soil selection.
- Plant seeds 1/4 to 1/2 inch deep (10 seeds per foot) in single, double or triple rows 12 to 18 inches apart.
- Thin seedlings to 4 inches apart for leaf lettuce and 6 to 8 inches apart for Cos or Butterhead.
- The seedlings removed may be transplanted or eaten.
- Transplant Crisphead seedlings 10 to 12 inches apart in the row.