Gadenin日本語Get the app
Lactuca sativa var. capitata
Growing calendar
Typical timing for central Japan (Kanto region). Shift it for your own climate, and record your actual dates.
Guides
- How to Grow Lettuce from Seed: Light, Soil Warmth and Summer Sowing
- Types of Lettuce: Crisphead, Butterhead, Romaine and Loose Leaf
- Why Lettuce Does Not Form a Head, and Why It Turns Bitter
- Lettuce Diseases and Pests: Keeping the Crown Dry
- When to Pick Lettuce and How to Cut and Come Again
- Lettuce Growing Calendar: Spring and Autumn Sowings
Common problems
Start from what you can see on the plant.
Varieties (30)
30 head lettuce varieties have their own page, with days to maturity, growth habit, traits and uses.
See all 30 head lettuce varieties
Pests and diseases (44)
Problems recorded for this plant, most serious first.
Sclerotinia Rot
MajorDisease
The crown, stem or head rots in a water-soaked way and is covered in white cottony mycelium. Black sclerotia later form inside and on the surface, and the plant wilts and dies.
Aphids
CommonPest
Small green or black insects cluster on shoot tips and leaf undersides, crinkling the leaves and stopping growth. The honeydew they excrete supports sooty mold that blackens the foliage.
Slugs
CommonPest
Irregular holes are chewed in leaves and fruit with glistening slime trails nearby. By day they hide under pots and bricks or in dead leaves at the base of the plant.
Bacterial Soft Rot
CommonDisease
The crown or the head becomes water-soaked and soft, then collapses into a slimy mush. The rotting tissue gives off a distinctive foul odor.
Downy Mildew
CommonDisease
Pale yellow to yellow-brown angular lesions form on the upper leaf surface with a gray-purple mold in the matching spot underneath. Lesions merge, the leaves die back and the plant declines early.
