What could be the problem? Synopsis: Potted, indoor, Improved Meyer Lemon with mostly healthy-looking, perky leaves. Regularly dropping green leaves, some twigs are turning brown. Dropped its only several-months-old lemon. Two new, unopened blossoms. 46â€™â€™ tall w/pot. Dropping 3-8 leaves a day. Most fall off leaving the petiole attached to the branch, but about a quarter of the leaves fall off with the petiole attached to the leaf. The dropped leaves usually appear as healthy and green as the attached leaves. Very occasionally a leaf will wither and dry up before falling off. One or two leaves have turned yellow before dropping, but it is only slightly more common than the leaves withering before dropping. The original lemon just fell off today, still green and maybe less than two inches long. Just recently some of the bare twigs are dying. I prune off the branches that turn brown; if not it would look pitiful. It appeared to be making efforts at new growth, with very tiny green bumps on the tips of a few branches. However, a week later those bumps seem less obvious and maybe have stopped growing and dried. Conditions: Location: Utah, low humidity, sun, 80s-high 90s daily in the summer. For a couple months I regularly took it outdoors. Indoors, 8â€™â€™ at its closest point from a F15T8 grow light, off at night. Rotated daily. 6-7 ft. from a large west window, although a dresser partially shades it from that sun. Potted in well-draining soil (top of the soil is loose and dry when it needs water) in a 10-11â€™â€™ diameter, 12â€™â€™ tall pot from the nursery. Temp. is approx. 75Â°. Its room is slightly warmer and more humid than the rest of the house because I often leave the window open. No direct breeze from vents, but air conditioning. When the top two or so inches of soil are dry I take the pot outside to water (secondary water, no chlorine/fluoride) and fertilize it with Miracle Grow Azalea Camellia Rhododendron food fertilizer, identical to Miracid (30-10-10). I use half a teaspoon/ 2 liters of water every time I water, but I let the water drain out onto the cement until none leaks out. A month ago I flushed out the soil with plain water in case salt was building up. When I disturb the soil I can see miniscule, soft-bodied jumping insects scatter. I researched them and think they are springtails: http://www.springhalen.dk/folsomia.JPG There was a small centipede in the soil last week. I understand neither of these is harmful. There is no webbing, dust, stickiness, other apparent pests, nor strange residue on the plant. The only possible exception is when I touched the last lemon that fell off it felt very slightly tacky on part. The skin looked clean and normal. History: The tree appeared healthy when I got it early this June. It had one Â¾â€™â€™ to 1â€™â€™-or so lemon and a few blossoms. I couldnâ€™t find any pests on it. The leaves did appear to have been damaged at one point, having some small holes in the leaves and leaves that had curled-in strangely at the edges. Many of the leaves also had raised bumps (raised if viewed from above, indented from beneath). Before I bought it I asked the man who â€œknew aboutâ€ the citrus if that was a problem and he said no, that it was probably just some hail damage or something from the original nursery. The tree has dropped leaves the entire time Iâ€™ve had it. I shocked the plant by putting it in direct sun with no transition period. I would heavily mist or lightly spray off the branches with the hose, then leave it in the sun for a few hours outdoors (hot and sunny with low humidity.) I realized my mistake and from then on when I moved it outdoors only let it sit in the shade or dappled sunlight. I left the tree with my grandmother for a month. She watered it as I instructed her, same fertilizing, draining in her sink for a few hours after. She kept it in a bright room with big western and northern windows. When I got home it was losing leaves and I discovered what looked like rust mites: http://4.bp.blogspot.com/_8xC9bwq6A...UxMVdd7c/s1600-h/bald+cypress+rust+mite+4.JPG on it. Iâ€™d thought at first they were mealy bugs (which killed a palm before I got the lemon), from the cottony stuff and the appearance of the big ones but they moved too quickly. I swabbed off any I could find with alcohol and rinsed the tree off, then I sprayed the tree with neem oil. The tree had bloomed and produced seven lemons, about Â¾â€™â€™ long. They turned slightly yellow then all fell off but the much larger original lemon that came with the plant. I found mites tucked inside the stem where the lemons had been attached. As they were dropping I doused every little lemon with neem, especially where they were attached, but was too late. About a week later I repeated neem to be careful, but saw no mites. Several weeks later I found a single large mite. I scoured the tree for more but found none. I sprayed it with neem to be safe. I got in the habit of misting the tree with water about twice a day, sometimes much more. Here are photos of the tree and its environment: http://s180.photobucket.com/albums/x165/anima1_kid/lemon tree/ Let me know if you'd like more information or photos. I think Iâ€™ll add a pebble tray. Would such an immature lemon ripen off the tree? Thank you so much!