Troubleshooting
Calamondin orange problems — and how to fix them
Calamondin orange (Citrus × microcarpa) 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.
Leaf drop
Usually caused by sudden temperature swings, cold draughts, over- or under-watering, or a sharp move from outdoors to a dry heated room.
Yellowing leaves
Often a nutrient shortfall (nitrogen, iron or magnesium) in hungry citrus, but also caused by overwatering and waterlogged, poorly drained compost.
Spider mites
Fine webbing and pale stippling on leaves appear when air is too dry and warm; these sap-suckers thrive in low humidity indoors.
Scale insects
Brown limpet-like bumps on stems and leaf undersides that excrete sticky honeydew, which in turn encourages sooty mould.
Sooty mould
A black, soot-like coating on leaves growing on the honeydew left by scale, aphids or whitefly rather than infecting the plant directly.
Flower and fruit drop
Triggered by inconsistent watering, low humidity, draughts or insufficient light, which stress the plant into shedding developing blossom and fruit.
Prevent calamondin orange problems before they start
Most calamondin orange issues are care-mismatch, not bad luck. Dial in the basics:
- Common calamondin orange problems — our other guide for the same plant
- PictureThis alternatives — 7 plant ID apps compared
- Calamondin orange watering schedule
- Calamondin orange light requirements
- Best soil mix for calamondin orange
- Calamondin orange temperature & humidity
- Full calamondin orange care guide
Calamondin orange problems — FAQ
Why is my calamondin orange leaf drop?
Usually caused by sudden temperature swings, cold draughts, over- or under-watering, or a sharp move from outdoors to a dry heated room.
Why is my calamondin orange yellowing leaves?
Often a nutrient shortfall (nitrogen, iron or magnesium) in hungry citrus, but also caused by overwatering and waterlogged, poorly drained compost.
Why is my calamondin orange spider mites?
Fine webbing and pale stippling on leaves appear when air is too dry and warm; these sap-suckers thrive in low humidity indoors.
Why is my calamondin orange scale insects?
Brown limpet-like bumps on stems and leaf undersides that excrete sticky honeydew, which in turn encourages sooty mould.
Why is my calamondin orange sooty mould?
A black, soot-like coating on leaves growing on the honeydew left by scale, aphids or whitefly rather than infecting the plant directly.
Why is my calamondin orange flower and fruit drop?
Triggered by inconsistent watering, low humidity, draughts or insufficient light, which stress the plant into shedding developing blossom and fruit.