Mine is doing the same thing. I hope someone else will chime in. I do notice that the leaves dropping appear to be older leaves. I wonder if it is dropping those to gather energy since mine is full of fruit.

Thank you, I thought the spot on the leaf may indicate a moisture problem. The tree sits by a southern and eastern window with plenty light… Perhaps I should stop feeding during the winter and just water with aquarium water.The tree hasn't grown since it formed 6 fruits last summer.

I constantly spray water on the tree to avoid mites and occasionally treat with horticultural oil to control scale.

That is good to know. Mine is very bushy as well, and perhaps I should cut back on the fertilizer (I also use Foliage Pro). The thing is that it is so loaded with fruit (I've thinned them out some) that I worry it is using up nutrients quickly. My tree is about 5 ft. and very bushy.

Great..Just to let you know that fertilizing in winter is not taboo, not if they get lots of sunlight and heat such as let's say a 'greenhouse' or super duper artificial lights in a warm environment and use of a mix that does not allow salt toxicity......Many citrus trees are very active and growing like crazy especially now that the sun is higher in the sky and getting much brighter...But for those of us limited to just an indoor window with limited daylight direct sunlight you are forcing your trees to grow weaker growth than that if grown outdoors, It has always been my goal to give what my trees need at the proper for optimal growth. If I am going to fertilize, then I am going to decide to provide everything they need to grow strong growth not susceptible to pests.

Protecting them from bugs all winter is a great idea, but most chemicals, soaps and oils should be used sparingly...I have always had success killing bugs using oils often, but then to you risk the chance of suffocating your leaves too causing leaf drop. You have to use sparingly and follow directions carefully, even when using natural products. A GREAT control of mites is just plain ole water often which disrupts their breeding cycle...Just an FYI )

Yes, plain ole water sprayed daily hinders spider mites at my house. It is the best thing for palms. I usually wait until summer to treat scale, while the trees are outside and getting optimum light. Mikerno, What do you suggest to use for scale ?

I did not know about the water. I will definitely try that! Thank you!

I have several Ladybugs in my house this winter. I hope that they are eating spider mites and other plant pests.