I have a three year old meyer lemon three in a self watering container. I have had the tree for one year. The three is positioned at my south facing balcony window and because of the limited sunlight I also have a sunlamp shining on it for about eight hours a day. In December the tree produced two wonderfully ripe and tasty lemons.
Now on to the perplexing bit...
Since harvesting the two lemons back in December (2 months ago) my tree has been steadily losing leaves. The leaves appear to be normal when they drop without any discoloration. As of today the tree has only about 25% of its foliage left on the tree. But the tree also has two new lemon starts that seem to be doing fine (so far) as well as many new lemon blossoms just starting to emerge. So it looks like a leafless tree with lots of blossoms. I also noticed thorns on the tree (I thought meyer lemon trees did not have thorns) which I never noticed before.
Is my tree ill? Is the leave drop normal for this sort of tree? I really do not want my tree to die and any help anyone can offer would be tremendous.