Troubleshooting
Butterhead Lettuce problems — and how to fix them
Butterhead Lettuce (Lactuca sativa var. capitata) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Bolting (premature flowering)
Triggered by temperatures above 24°C, long days, or drought stress. Once bolted, leaves become bitter and inedible. Choose bolt-resistant varieties ('Buttercrunch', 'All Year Round'); provide afternoon shade in summer; water consistently; succession-sow every 3 weeks to maintain supply.
Slugs and snails
The soft, low-growing heads are extremely vulnerable, especially at the seedling stage and in wet weather. Use copper tape around containers, beer traps at ground level, or apply nematode biocontrol (Phasmarhabditis hermaphrodita). Check under outer leaves daily.
Tip burn (calcium deficiency / poor translocation)
Brown, papery leaf edges, especially on inner leaves, caused by rapid growth in heat or low humidity impairing calcium uptake — not a soil deficiency. Improve airflow, water consistently, avoid high-nitrogen feeds, and harvest promptly when heads are full.
Prevent butterhead lettuce problems before they start
Most butterhead lettuce issues are care-mismatch, not bad luck. Dial in the basics:
- Common lettuce problems — the species this cultivar belongs to
- Common butterhead lettuce problems — our other guide for the same plant
- What's wrong with my plant? — the diagnosis apps compared
- Butterhead Lettuce watering schedule
- Butterhead Lettuce light requirements
- Best soil mix for butterhead lettuce
- Butterhead Lettuce temperature & humidity
- Full butterhead lettuce care guide
Looking for butterhead lettuce in general rather than its problems? Read the full butterhead lettuce care guide — light, water, soil and feeding.
Butterhead Lettuce problems — FAQ
Why is my butterhead lettuce bolting (premature flowering)?
Triggered by temperatures above 24°C, long days, or drought stress. Once bolted, leaves become bitter and inedible. Choose bolt-resistant varieties ('Buttercrunch', 'All Year Round'); provide afternoon shade in summer; water consistently; succession-sow every 3 weeks to maintain supply.
Why is my butterhead lettuce slugs and snails?
The soft, low-growing heads are extremely vulnerable, especially at the seedling stage and in wet weather. Use copper tape around containers, beer traps at ground level, or apply nematode biocontrol (Phasmarhabditis hermaphrodita). Check under outer leaves daily.
Why is my butterhead lettuce tip burn (calcium deficiency / poor translocation)?
Brown, papery leaf edges, especially on inner leaves, caused by rapid growth in heat or low humidity impairing calcium uptake — not a soil deficiency. Improve airflow, water consistently, avoid high-nitrogen feeds, and harvest promptly when heads are full.