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Citrus plants uk
in Plants
Hi, can anybody tell me if this is a aphid or pest problem or something to do with the soil or anything else? Thanks for your help

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It will help people to offer some useful advice for you
They are evergreen which means they're always losing some leaves but should always be in leaf. Winter feed is high in potash and potassium plus magnesium and trace elements to help make good flowers and fruits. Summer feed is high in nitrogen for healthy foliage.
They prefer a slightly acidic soil so consider re-potting in John Innes no 3 ericaceous compost mixed with up to 20% ericaceous MPC for water retention.
Even here in western France I move mine to the polytunnel for winter and water occasionally when the compost feels dry. Once night time temps get above about 8 to 10C they come outside and spend summer against a south facing house wall in full sun.
I have a Meyer lemon, a limquat, both flowering well and a yuzu that's just started flowering for the first time this spring. I haven't had your problem with the foliage and can't find anything like it on the RHS citrus growing page so I'm assuming it's down to temperatures, feeding, watering and soil type.