My pot-grown lemon tree (variety unknown)has produced abundant flowers some of which have set fruit. After a while the majority of the fruits drop off and during the past couple of years only two fruit have reached maturity i.e the size which appropriately complements a gin and tonic!. The plant is kept indoors during the winter and on a balcony in full sunlight during the summer. The tree is watered when the soil at the top of the pot dries out; clay granules in the bottom of the outer pot are kept moist at all times. Feeding with a proprietary fertiliser (at the recommended strength) is done monthly. Any light you can shed on this problem would be most appreciated.
Certified GKH Gardening Expert
There can be many reasons for aborted fruit or fruit drop.
These articles will help you pinpoint the issue.