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Lactuca sativa 'John'

Lactuca sativa John
Lettuce 'John'

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An excellent variety of lettuce for forcing under a greenhouse or cold frame. With fast and healthy growth in cool weather, 'John' lettuce is a high-yielding selection that produces large, pale green heads with tender leaves, whose delicacy will delight gourmets. Ideal for early and late sowings under cover. Sow from September to March for a harvest from late October to early May.
Ease of cultivation
Beginner
Height at maturity
25 cm
Spread at maturity
25 cm
Soil moisture
Moist soil, Damp soil
Germination time (days)
10 days
Sowing method
Direct sowing, Sowing under cover
Sowing period February to March
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F
M
A
M
J
J
A
S
O
N
D
Harvest time May to June
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F
M
A
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J
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S
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Description

The 'John' Butterhead Lettuce is a vegetable selection that thrives in the cool temperatures of early spring or autumn. The edges of the leaves on this salad do not brown quickly and it takes a long time for it to go to seed. This variety can be sown in very cool temperatures, as soon as it reaches 10°C (50°F). Sow under cover and ventilate in hot weather. This lettuce is also suitable for outdoor cultivation during the summer season, it can be sown directly in the vegetable garden from mid-March.

 

If Lettuce is one of the most popular vegetables (4.2 kilograms are consumed per person per year), it is equally loved for its freshness, crunchiness, and taste as well as its nutritional qualities. It can be consumed raw in salads but also cooked, to accompany peas, for example.

The ultimate leaf vegetable, Lettuce is an annual plant that belongs to the large family of Asteraceae. Its Latin name, Lactuca sativa, refers both to the white sap (lactuca) that flows when it is cut and to the fact that it is cultivated (sativa).

It is an essential vegetable in any respectable vegetable garden and there are so many varieties that it can be grown almost all year round.

Cultivating Lettuce is easy as long as you respect the cultivation calendar for each variety. It grows quickly and thrives in any soil, as long as it is rich and remains moist.

Harvest: Simply cut it with a knife when it reaches maturity.

Storage: Lettuce can be stored for a few days in the refrigerator but, to enjoy its freshness to the maximum, we recommend consuming it right after harvesting.

Gardening tip: A real nightmare for gardeners, slugs and snails love lettuce leaves. When the hunt is on, we must admit that we are ready to do anything to repel or eliminate them: the ash cord (which will be quickly leached by the rain), the homemade trap filled with beer (which hedgehogs get drunk on until they reach an alcoholic coma), the copper strips that are supposed to electrocute them (which tickle them a little)...

Instead of wasting your time and, incidentally, your salads, we recommend using an anti-slug product composed of ferric phosphate known as Ferramol. Unlike metaldehyde-based anti-slugs, which are harmful to wildlife and polluting, Ferramol is natural, non-toxic, and very effective as long as you remember to "treat" your plot a few days before sowing.

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Harvest

Harvest time May to June
Type of vegetable Leaf vegetable
Vegetable colour green
Size of vegetable Small
Interest Flavour
Use Table

Plant habit

Height at maturity 25 cm
Spread at maturity 25 cm
Growth rate fast

Foliage

Foliage persistence Annual
Foliage colour light green

Botanical data

Genus

Lactuca

Species

sativa

Cultivar

John

Family

Asteraceae

Other common names

Lettuce 'John'

Origin

Cultivar or hybrid

Annual / Perennial

Annual

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Planting and care

Sowing:

The germination of Lettuce occurs at a temperature of about 18° and takes an average of 10 days.

Sowing is done from February to March for a harvest from May to June.

On well-prepared and loosened soil, make furrows spaced 25cm (10in) apart, with a depth of 0.5cm. Sow in rows, spacing the seeds 4cm (2in) apart and cover. After germination, when the plants are well developed, thin them out to leave one plant every 25cm (10in).

If your vegetable garden is often attacked by slugs and snails, we recommend sowing under shelter, in small pots, and transplanting the plants to the garden when they are well developed.

Cultivation:

Lettuce is not a very demanding vegetable but it still requires humus-rich soil, otherwise it tends to bolt prematurely. It is advisable to apply a moderate amount of mature compost in autumn, by lightly raking it into the soil to a depth of 5cm (2in), after loosening the soil as you would for any vegetable crop. It prefers slightly acidic to neutral soils (pH between 5.5 and 7.5).

During cultivation, remember that Lettuce prefers moist soil and remember to water regularly.

Lettuce is a good companion plant, it can be easily grown in between other slower-growing vegetables such as beans, tomatoes, cucumbers... Just avoid planting it next to corn.

 

Seedlings

Sowing period February to March
Sowing method Direct sowing, Sowing under cover
Germination time (days) 10 days

Care

Soil moisture Wet
Disease resistance Good
Pruning No pruning necessary

Intended location

Type of use Vegetable garden
Hardiness Hardy down to -23°C (USDA zone 6a) Show map
Ease of cultivation Beginner
Soil Fertile and rich.
Exposure Sun, Partial shade
Soil pH Any
Soil type Silty-loamy (rich and light), 192,130

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