Sow a few seeds directly into each planting hole and lightly cover with soil. Harvesting Lettuce. Simply allow the plants to mature on their own. Put the sowing in a cool space, this will help the seeds grow faster. About a week before your estimated harvest date, walk through your field and pick out a few lettuce heads that look ready. Harvest Crisphead lettuce—such as Iceberg with a solid, tight, spherical head–when heads are medium-size (6 to 8 inches/15-20 cm), round, and firm. Romaine or Cos lettuce form leafy green upright cylindrical or oval heads. Many gardeners have had success growing lettuce throughout the summer by planting it in a shaded spot in the garden. Tiny flowers bloom from this seed stalk, and then they self-pollinate to produce seeds. As the weather warms, plants will go to seed. Lettuce seeds can sprout as early as 2 days if the soil temperatures are between 55 and 75F (13-24C). Depth and Spacing. Sow again in midsummer for a fall harvest. Most are ready to be picked just 30 to 70 days after planting, once they’ve reached the size you’d prefer. Grows best in cool weather. Add to Wishlist Quick View. You know the seeds are ready to harvest when the pappus is well developed. Single-leaf lettuce plants should be 4 inches (10.2 cm) apart. If you get these basics down, you can have home-grown lettuce all through the year! Really, it is due to the lengthening of the days which coincides with the warmer summer months in the northern hemisphere. Saving lettuce seeds from your plants is relatively easy. Romaine lettuce is easy to grow. Pick all lettuce before a seed stalk forms. ... Because the small seeds have to be sown quite shallowly, it will be easier to keep seeds moist during germination if sown in trays. Young leaves will be the tastiest and most nutritious. D) Iceberg Lettuce Pick from varieties such as the Iceberg, Cos Lettuce or even Red and Green varieties, there are plenty to choose from to suit your needs. To harvest lettuce, simply cut it off near ground level. Come September start sowing winter lettuce seeds. All five varieties of lettuce (stem, loose-leaf, butterhead, crisphead and romaine) produce seeds in a similar manner: by sending up a seed stalk in the center of the plant. We recommend an indoor start, to allow time for the lettuce to mature, before hot weather sets in. Lettuce needs little introduction. Harvesting Lettuce Seeds An additional consideration when it comes to harvesting lettuce is whether or not you should be planting next year’s salads. Avoid sowing in the hottest and coldest months of the year, try sowing in short rows every fortnight to ensure continuity of cropping. Sow around eight seeds in a little pot. If you go with leaf lettuce, then you’ll have to trim it off when it is about 4-8-inches tall. In modern times it has been cultivated mainly for its edible salad leaves. Lettuce is one of the easiest garden vegetables to harvest. Saving Lettuce Seed: 3 Easy Methods. Sow every two weeks to extend harvests. Loose-leaf lettuce plants (Lactuca sativa) are fast-growing, cool-weather crops that are easy to plant and harvest.Unlike iceberg, butterhead, and romaine lettuce, these leafy greens and reds do not grow from a head or heart, making them an ideal low-maintenance crop. Take a look at our extensive selection of lettuce seeds … Perfect for use in sandwiches or salads, growing your own lettuce is perfect for kick-starting your healthy eating regime. Sow in late summer for fall crop. Crisphead or Iceberg lettuce form firm, compact heads of pale green, overlapping leaves. We have several lettuce varieties that include Bibb, Green & Red Leaf, Iceberg, Oak Leaf and Romaine. Transplant with care. Iceberg (crisphead) varieties take longer and should be harvested as soon as a head develops but before outer leaves turn brown. Types of Lettuce. Lettuce seeds are very tiny and only need to be sown 3mm deep. Lettuce (Lactuca sativa) is an annual plant of the daisy family, Asteraceae.It is most often grown as a leaf vegetable, but sometimes for its stem and seeds.Lettuce is most often used for salads, although it is also seen in other kinds of food, such as soups, sandwiches and wraps; it can also be grilled. We have seeds for many different varieties of lettuce, including Little Gem, Red Iceberg and Lollo Rossa. Each pair of lettuce seeds is attached to a white dandelion-like ‘parachute’ called pappus. How to Grow and Harvest Lettuce Lettuce has been grown for thousands of years (first by the ancient Egyptians) as an easy to grow food crop and for the oil rich seeds. LETTUCE - Iceberg - ‘Iceberg’ is the classic head lettuce that everyone loves best. To have continual harvest plant seeds every couple weeks. And, for the best flavor, you should harvest your lettuce in the morning. For best results, start seeds indoors, and transplant outdoors 3 weeks later. 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