Highest degree of tip burn in the green leaf lettuces trialed. Red Salad Bowl (RMSC) – Holds nearly as well as Bronze Arrow, a similar cut leaf type. Predators, rather than parasites have been the primary control agents observed. Pick bolted lettuce leaves that are medium to light-green in color with a tender, delicate feel at the tip. Envy (JSS) – Uniform, and reliable to 75 plus days. Biochemists have identified compounds responsible for the bitter taste of lettuce. You will need to provide supports along with the cover in order to keep the cloth elevated above the plants giving them room to grow. So if one is going to bolt, they all will. When lettuce bolts and runs to seed long before the plants mature it’s usually a sign that the plants were stressed in some manner. In an experiment, a normal lettuce flowered after 150 days in a greenhouse, whereas a mutant flowered in 55 days. Introducing "One Thing": A New Video Series, The Spruce Gardening & Plant Care Review Board, The Spruce Renovations and Repair Review Board. Again there appeared to be strong varietal resistance to either the leafhopper or the disease. Lettuce Boling: When temperatures rise much above 70°F/21°C, lettuce—an annual—will send up stalks, flower; this is called bolting. GREEN ROMAINE Salad Bowl (RMSC) – Holds very long in the early season, but bolts quickly in the heat. But I’m happy to understand the reasons behind early bolting now. Conducting trials in your own garden to assess bolting resistance seems like a first requirement for obtaining tasty lettuce over a longer time. Romaine seedlings can withstand frost and can be transplanted into the garden as soon as … Color is not as deep red as some. Add the leaves to soup. The plant builds the rings in a number of steps starting with acetic acid (vinegar), which has two carbon atoms. It is either hot or very cold but mostly hot and dry. • Cimmaron romaine lettuce. Romaine needs 70 to 75 days to mature. Despite its heritage, modern lettuce thrives best in cool climates and moist soil. Wine red, good for baby lettuce. Well I will now forget about fresh sweet lettuce. Bronze Arrow I hope to share the incredible lessons learned and make things a lot easier for you out in the organic vegetable garden. Integrata ( JSS ) – Fair to poor holding through the heat. Copyright © 2020. Marin (JSS) – Holds reliably to 75 days, has relatively less tip burn than others in its class. It was a small way to say thank you for the efforts…. – Thought maybe I over fertilized. This bolting stage is that phase of growth when your crop forms its flowering stalks. Subsequently nearly all caterpillars have been successfully controlled by natural enemies. Going to read on, maybe there is something else to plant. Plants grown in plant growth chambers under short days of eight hours of sunlight at a steady high daytime temperature of 90˚F grew to harvest maturity without bolting. It … Join Fine Gardening in upcoming webinars. Overall they are a versatile and good performing lettuce, and are highly recommended for Colorado growers. Good performance later in the summer, making good size heads, and holding well. Good for them and the bees – not so good for me! Dark Green Boston (RMSC) – Held between 70 and 85 days. Damage by tip burn was the least of the butters. I’ve noticed vegetable seedlings the size of transplants that were deprived and stressed to the point that they sent up a seed stalk and flowered right in their cell-paks on the shelves of the greenhouse. For years I have tracked bolting in many varieties of looseleaf, butterhead or Bibb, romaine, and other lettuce classes. Clear, concise, and great help to the gardener who wonders why he gets a flower spike instead of a head of cabbage. Less tip burn than other Waldmann types. Seed supplier abbreviations are: JSS = Johnny’s Selected Seed, HM = Harris Moran, RMSC = Rocky Mountain Seed Company, SOC = Seeds of Change, and V = Vilmorin. Second best for tip burn resistance. The stems (and yes, lettuce plants do have tall thick stems when they bolt), if not too tough yet, can be sliced and stir-fried as well; to me it tastes a little bit like potato. Some wild lettuce species have higher concentrations of sesquiterpene lactones than domesticated lettuce. So scientists have been looking at the flowering phenomenon known as bolting to learn how we might better our odds of keeping a palatable crop. What’s less well known is why it happens. The lettuce was sown in the green house into 72 cell trays, and grown-out there for about 30 days. This ‘Freckles’ lettuce plant has gotten the message. With an amazing selection of beautiful fall-blooming and fall-foliage plants and with the soil still warm, fall is a great time…, Danielle was convinced that this was HER episode, considering she’s shorter than Steve. If you have chickens they will love the entire plant though. Cimmaron too. Head character was quite different between varieties. Red Oak leaf type, very attractive green to red mottled, excellent quality early, powdery mildew susceptible late, Galactic (JSS) – Held well but failed to size. The Spruce uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. • Grand Rapids TBR leaf lettuce. Once the seed shoots appear, you can trim them back, but be prepared to do this daily in order to keep them back. The varieties that we worked with were those provided by seed companies, some of which are currently grown here, and others which are not.