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Annual Biennial

Lactuca sativa 'Little Gem'
  • RHS AGM

lettuce (Cos) 'Little Gem'

'Little Gem' is a dwarf cos lettuce, a leafy biennial usually grown as an annual. It produces small, dense, heads with a crisp, sweet heart from spring to autumn according to sowing date

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Size
Ultimate height
0.1–0.5 metres
Time to ultimate height
1 year
Ultimate spread
0–0.1 metre
Growing conditions
Chalk
Clay
Loam
Sand
Moisture
Moist but well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer Green
Autumn Green
Winter
Position
  • Full sun
Aspect

South–facing or East–facing

Exposure
Sheltered
Hardiness
H2
Botanical details
Family
Asteraceae
Native to the UK
No
Foliage
Deciduous
Habit
Clump forming
Genus

Lactuca can be annuals, biennials, perennials or shrubs, with alternate leaves, milky white sap and daisy-like flowers in white, yellow or blue. The genus includes a wide range of wild plants, as well as species cultivated for their edible leaves (lettuce)

Name status

Accepted

How to grow

Cultivation

Grow in full sun on moisture-retentive soil. Sow a short row every fortnight to ensure continuity of cropping. Use cloches, plastic tunnels or horticultural fleece to protect early and late crops. See Lettuce (Grow your own)

Propagation

Propagate by seed. See sowing vegetable seeds

Suggested planting locations and garden types
  • Patio and container plants
Pruning

No pruning required

Pests

Resistant to lettuce root aphid, but vulnerable to slugs and snails

Diseases

May be affected by grey moulds and lettuce downy mildew

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