Romaine lettuce is part of the Lactuca (Lettuce) genus. Its scientific name is Lactuca sativa var. longifolia. The botanical name epithet for Romaine lettuce (sativa) means 'having been cultivated'.
Cos lettuce are easily recognisable as they are oval rather than round. The leaves are more robust than round lettuce and have a slightly bitter but pleasant taste.
Blooms appear in these approximate colours: Unmellow Yellow. When mature, blooms are roughly 1.0 cm (that's 0.39 inches in imperial) in diameter. The mature flowers take a single form, with an approximate petal count of 4. Leaves appear approximately as a Forest green (web) and La Salle Green
It is a flowering edible vegetable that typically grows as an annual, which is defined as a plant that matures and completes its lifecycle over the course of a single year.
Romaine lettuce is known for growing to a height of approximately 7.8 inches (that's 20.0 cm in metric) with a stemless habit. This plant tends to bloom in late summer.
Romaine lettuce is normally quite a low maintenance plant and is normally very easy to grow - great for beginner gardeners!
This plant info is provided by the myfolia gardener's wiki. All details about Romaine lettuce have been kindly provided by our members.
Use fleece to protect the growing seedlings from the worst of early season bad weather, and late season sun. Fleece also helps to keep pests at bay,
Harvest as soon as the leaves are useful, keeping the growing plants evenly moist to reduce bolting
Try to plant in a location that enjoys partial sun and remember to water often. Use Zone 4 - Zone 9 as your guideline for the appropriate climate for this plant. Romaine lettuce needs a loamy, potting mix and clay soil with a ph of 6.2 to 6.8 (weakly acidic soil). Keep in mind when planting that Romaine lettuce is thought of as tender, so it is imperative to wait until temperatures are mild before planting out of doors.
See our list of companion Plants for Romaine lettuce to see which plants you should plant in close proximity to encourage growth.
Sow directly, and cover only lightly. Sow thinly to avoid having to thin too many seedlings. seeds need light to germinate
Sow a few seeds every two or three weeks, to prolong the crop
By our calculations*, you should look at sowing Romaine lettuce about 60 days before your last frost date .
Sow direct, lettuce do not transplant easily, thin seedlings to give the remaining plants room to grow.
Eat the thinnings
Harvest as soon as the leaves are a useful size, choosing the plants that will release the growing room for those remaining.
Pull carefully, so as not to damage the roots of the remaining plants
Lettuce easily bolt and flower, and can be grown from seed collected into a paper bag.
Seed viability is three years.
These estimates for how long Romaine lettuce takes to sprout, grow and harvest are from real observations from real gardeners, right around the world.
Average 7 days | Min 1 days | Max 23 days (347)
Average 31 days | Min 2 days | Max 58 days (26)
Average 50 days | Min 4 days | Max 142 days (190)
Our when to plant Romaine lettuce estimates are relative to your last frost date.
Most dictionaries trace the word cos to the name of the Greek island of Cos, from which the lettuce was presumably introduced. Other authorities (Davidson) trace it to the Arabic word for lettuce.
Romaine lettuce is often used in the Passover Seder as a type of bitter herb, to symbolise the bitterness inflicted by the Egyptians whilst the Israelites were slaves in Egypt.
Cos lettuce, Lattuga romana, Laitue romaine
Lactuca sativa longifolia
Misspellings: Romain, romain lettuce
Lovely red color! Lettuce was bitter, but I think I left it too late in the heat and did not soak.chill it well. I’ll try again next year.
KiriBean about growing Lettuce, romaine 'Red Romaine' (OP) (H)
My first time growing this variety. Germination was erratic, plants were slow to take off, flavor a little stronger than I liked, but harvested plants were beautiful. Will try again this fall.
mpsprengeler about growing Parris Island Romaine - 2nd sowing
I’ve grown this variety of Lettuce several times this year. I’m very pleased with them. They germinate very well & quickly & grow quite fast. I planted out my 3rd sowing 30th June on Gerry’s allotment
Amarylis about growing Romaine lettuce 'Parris Island Cos'