Troubleshooting
Key lime problems — and how to fix them
Key lime (Citrus aurantifolia) 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
Key lime is the most cold-sensitive common citrus. Even a brief dip below 2°C can kill new growth and cause significant dieback. Bring containerised plants indoors as soon as temperatures drop in autumn.
Thorns causing handling injuries
Sharp thorns on branches are normal but can cause scratches when pruning. Wear thick gloves; remove thorns from main scaffold branches if growing as a container specimen.
Spider mites in dry conditions
Fine webbing on leaf undersides, bronzed foliage. Raise humidity, spray foliage with water, and apply insecticidal soap or neem oil. Key lime is particularly prone in dry heated rooms.
Prevent key lime problems before they start
Most key lime issues are care-mismatch, not bad luck. Dial in the basics:
Looking for key lime in general rather than its problems? Read the full key lime care guide — light, water, soil and feeding.
Key lime problems — FAQ
Why is my key lime frost damage?
Key lime is the most cold-sensitive common citrus. Even a brief dip below 2°C can kill new growth and cause significant dieback. Bring containerised plants indoors as soon as temperatures drop in autumn.
Why is my key lime thorns causing handling injuries?
Sharp thorns on branches are normal but can cause scratches when pruning. Wear thick gloves; remove thorns from main scaffold branches if growing as a container specimen.
Why is my key lime spider mites in dry conditions?
Fine webbing on leaf undersides, bronzed foliage. Raise humidity, spray foliage with water, and apply insecticidal soap or neem oil. Key lime is particularly prone in dry heated rooms.