Troubleshooting
Lisbon Lemon problems — and how to fix them
Lisbon Lemon (Citrus limon 'Lisbon') 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.
Frost damage
Hardier than most lemons but still tender; new growth and fruit are killed by hard frost. Protect or bring containers under cover when temperatures approach freezing.
Interveinal chlorosis
Yellowing leaves with green veins indicate iron or magnesium deficiency, common in pots and hard-water areas. Apply a citrus feed with chelated iron and magnesium.
Fruit and flower drop
Caused by drought stress, erratic watering or underfeeding during the heavy fruit set. Keep moisture and nutrition consistent through the cropping period.
Scale, mealybug and spider mites
Common pests indoors and under glass, producing honeydew and sooty mould. Treat with horticultural oil or insecticidal soap and improve ventilation.
Prevent lisbon lemon problems before they start
Most lisbon lemon issues are care-mismatch, not bad luck. Dial in the basics:
Looking for lisbon lemon in general rather than its problems? Read the full lisbon lemon care guide — light, water, soil and feeding.
Lisbon Lemon problems — FAQ
Why is my lisbon lemon frost damage?
Hardier than most lemons but still tender; new growth and fruit are killed by hard frost. Protect or bring containers under cover when temperatures approach freezing.
Why is my lisbon lemon interveinal chlorosis?
Yellowing leaves with green veins indicate iron or magnesium deficiency, common in pots and hard-water areas. Apply a citrus feed with chelated iron and magnesium.
Why is my lisbon lemon fruit and flower drop?
Caused by drought stress, erratic watering or underfeeding during the heavy fruit set. Keep moisture and nutrition consistent through the cropping period.
Why is my lisbon lemon scale, mealybug and spider mites?
Common pests indoors and under glass, producing honeydew and sooty mould. Treat with horticultural oil or insecticidal soap and improve ventilation.