Can I ask for advice please? I have a lemon tree about five years old. It lives in the conservatory, but goes outside in the summer (well, if we have one!). It's fed Westland citrus liquid feed once a week. It's just been repotted today into the next size pot up, with citrus compost. It's not kept too wet. In the past week or so it has dropped leaves at an alarming rate. Leaves aren't yellowed. Plant is flowering at the moment. Other plants in the same room are fine. No sign of pests. Any idea please?