I received a meyer lemon in December for xmas. The tree is indoors, with a grow light. I watered it once, and everythng started going great. Then the second time I watered it, all the leaves turned yellow and started to fall off. I called the nursery and they told me they accidentally sent out a tree with a larger root ball than they thought, and to transplant it to a larger container. Did that last week, to a 15x15x15 footed with a drain hole. Used 2 parts miracle gro, 1 part perlite, and 5 lutz tablets. I watered it in really well, and am now down to 1 leaf. Howver, under neath where all the leaves were, there are shoots that look just like the "shaft" of the leaves. Are those going to t urn into new leaves? I'm new to tree gardening.
The two main causes of leaf drop in citrus are overwatering and exposure to sun while the roots are cold (below 60 F). Your tree can be saved, but you need to change the potting soil to a fast draining mix that will hold lots of air. I use a mix of 4 parts pine bark chunks (1/2 to 1 inch size) to 1 part potting soil (or peat moss). Don't water until the top 2-3 inches are dry. If you have a saucer under the pot, put the pot on something to keep it out of the excess water. When you water-- water so that at least 10% of the water flow out of the pot. I am not familiar with lutz tablets, but I assume they are a form of fertilizer. Do not add any more fertilizer until the tree starts to grow. Citrus are heavy feeders and use fertilizer in the ratio of 5-1-3 (NPK). Try to find a slow release fertilizer with trace minerals (Osmocote or Dynamite with a NPK of something like 18-6-12 for example). with slow release fertilizer, you only need to add it a couple times a yr. Be aware, you fertilize according to pot size, not tree size. If your fertilizer does not contain trace minerals, you will have to add them separately. Skeet
It sounds like you are describing the petioles or leaf stalks. Leaves being shed without having petioles attached to them is a sign of stress to the tree. The petioles will eventually be shed as well.
