See all of our brand-new seed pack offerings in our store. For extra cleaning use reverse screening, with a smaller mesh that retains the seed but lets small pieces or chaff and plume through. See our seed starting tips to prepare for your gardening season.  The consumption of lettuce in China developed differently from in Western countries, due to health risks and cultural aversion to eating raw leaves. Seeds per pack: 1000  This propensity for crossing, however, has led to breeding programs using closely related species in Lactuca, such as L. serriola, L. saligna, and L. virosa, to broaden the available gene pool. Baby greens are collected when between approximately 28-35 days after germination, and are collected. 2) The leaves are shaped like oak tree leaves.  Scientific research into the genetic modification of lettuce is ongoing, with over 85 field trials taking place between 1992 and 2005 in the European Union and United States to test modifications allowing greater herbicide tolerance, greater resistance to insects and fungi and slower bolting patterns.  There are also a few varieties with yellow, gold or blue-teal leaves. Please note, our Visitors Center is closed until further notice. Each fruit contains one seed, which can be white, yellow, gray or brown depending on the variety of lettuce. Appearance1000 Yes45heat tolerantNotight perfectly round heads of crinkled leaves.The Oakleaf type lettuce has tender, medium-green leaves resembling those from an oak tree. Amend prior to planting if needed. Make succession plantings every week or two, and grow several varieties with different maturity dates for a continuous supply. Large, bright green oakleaf with dense heads and long harvest window. Please select options before adding to cart. Romaine and Butterhead lettuce can be harvested in about 60 to 70 days from planting.  Lettuce is closely related to several Lactuca species from southwest Asia; the closest relationship is to L. serriola, an aggressive weed common in temperate and subtropical zones in much of the world. Rubbing separates the plumes and chaff from the seeds. When buying oak leaf lettuce, everyone should know that this plant has to be deeply coloured, and its leaves have to be curly, crisp and firm. Ideally, greens should be collected early in the day, before the onset of midday sun, to prevent wilting. The heads are slow bolting and compact.  In spite of its high water content, traditionally grown lettuce has a low water footprint, with 237 liters of water required for each kilogram of lettuce produced. Best Features: 1) Oak Leaf Lettuce is frost tolerant so you can sow the seeds in early spring. Different locations tended to prefer different types of lettuce, with butterhead prevailing in northern Europe and Great Britain, romaine in the Mediterranean and stem lettuce in China and Egypt.  The name romaine came from that type's use in the Roman papal gardens, while cos, another term for romaine lettuce, came from the earliest European seeds of the type from the Greek island of Cos, a center of lettuce farming in the Byzantine period. Three types – leaf, head and cos or romaine – are the most common. integrata and L. scariola var. Space other varieties 6 to 10 inches apart in rows 12 to 18 inches apart. You can also lightly broadcast seed (particularly of looseleaf varieties) in a patch instead of a row. When completely dry, shake the flower stems in the bag.  Lettuce plants have a root system that includes a main taproot and smaller secondary roots. Conventional seed with NOP-compliant pelleting. In all cases, thin sprouts down to one every 10 to 12 inches (25 to 30 cm) as soon as the first leaves appear. Before you harvest, consider which varieties you might want to save seeds from so that your harvesting practice includes plants chosen for seed saving. Best grown in cooler weather. In addition to its main use as a leafy green, it has also gathered religious and medicinal significance over centuries of human consumption. Water lightly but consistently. For an early start, seeds can be started in flats 4 weeks prior to the last frost and transplanted outdoors in mid to late spring. It is most often grown as a leaf vegetable, but sometimes for its stem and seeds. Radiant burgundy version of an old favorite; delicate oak-like leaves. if you can get over the idea that you are eating lettuce that looks like the tree leaves all around you then this is a great lettuce.  Lettuce is also used as a primary ingredient in the preparation of lettuce soup. Some American settlers claimed that smallpox could be prevented through the ingestion of lettuce, and an Iranian belief suggested consumption of the seeds when afflicted with typhoid. Lettuce is also eaten as part of the Jewish Passover Seder, where it is considered the optimal choice for use as the bitter herb, which is eaten together with the matzah. Reliable and quick germination, they Kratky well, and is quite tasty. As the season progresses, plant more bolt-resistant varieties. View our live and pre-recorded virtual events. Heavy, dark green oakleaf with fast early growth and sweet flavor. In 1586, Joachim Camerarius provided descriptions of the three basic modern lettuces – head lettuce, loose-leaf lettuce, and romaine (or cos) lettuce. Annual Many varieties of looseleaf lettuce can be harvested numerous times during a single growing season after being cut approximately 1" above the ground. In French it is called feuille de chene and it grows in areas characterised by Mediterranean and temperate climates. It is also somewhat heat tolerant so the leaves resist getting bitter. The Romans likewise claimed that it increased sexual potency.  Between the late 16th century and the early 18th century, many varieties were developed in Europe, particularly Holland. I grew it in a pot, sown heavy, and trimmed the tops in the spring. Lactuca sativa is a member of the Lactuca (lettuce) genus and the Asteraceae (sunflower or aster) family. Both green and red oak lettuce … Striking red leaves with bright green interior for stunning contrast. In the US, no one type predominated until the early 20th century, when crisphead lettuces began gaining popularity. This page was last edited on 7 November 2020, at 23:55. It has few leaves, bolts quickly and produces seeds around 50 percent larger than other types of lettuce.