Welcome Emily and Hello John! Emily, first and utmost, where do you live? When can you put your tree outdoors? That tree is small enough to wipe every leaf off with warm milk and water often. If it can't be oudoors for a while, I would watch your watering closly as John says. I must say it looks like it is in a great mix. Is that the 5.1.1 mix many here use? Mostly bark? Very porous? That was a great catch on your part, finding the mites. Most would not be aware of this factor so my hats off to you for controlling it. I would make sure it gets lots of sunlight at this point. even if it should drop all the leaves, at least the roots will stay strong and still push new growth accustomed to new light levels. I have many times actually plucked every leaf off just to have the tree come back bushier than ever. They are more resilient than one might think. I would of held back on fertilizing after an attack as so, because you don't want to encourage new growth in your warm , dry conditions unless you can figure a way to discourage mites from coming back to eat the fresh foiliage about to grow with 'constant' air movement aimed to blow towards under the leaves. Never shut your fan off and see if you can use a small table one with low speed. If I have had a mite infestation,I would actually snip of all the new growth until I can almost put them outside to be on the safe side from stragglers then treat and treat all summer so I don't bring them in the following fall. I always make sure the environment for mines are just right to reduce mites infestation possibilities. For instance. >If they are indoors, in my house, in a sunny window, I like to keep the room very cool with fans and moisture in which mites or any pests detest. >For those in the greenhouse, I fertilize regularly for new 'strong' growth along with moist air, and air that is constanly being moved my fans. I am not worried about spindly growth in this case or tender desirable leaves because they are getting all day sun and grow tougher. In there, I deliberately let temps drop to the 50's at night though again which mites despise. >At work, where conditions are very dry, I constantly wipe the leaves off those with warm milk and water, and shower them once in a while to keep the leaves clean. Keeping your tree in a well draining mix, in a full sunny south facing window, leaves clean, fertilizing very lightly to discouarge fresh tender foliage until you are ceratin you have no mites, will help your tree make a full recovery in time for outdoors. Please, don't fret if those leaves fall off, since many citrus shed leaves anyway for various reasons. As long as you are not loosing branches due to root issues caused by over or under watering or a poor soil mixture, it will come back strong once it sees the great outdoors if not sooner:-) Mike

Its always had plenty of light, been outdoors in Los Angeles. Never repotted, which I suspect it needs to. My mom used to fertilize it every now and then, but it was still not well. I fertilized again a couple weeks ago. She used some type of fertilizer sticks, I use Lilly Miller Citrus + Avacado food (it says natural ingredients). A lot of the leaves fall off, as well as the tiny lemons that try to grow. It is definitely struggling. Thanks!

i agree .... on repotting... i would have done it a few weeks back ... but what i dont know.. is if you can do it.. without aborting the fruit ... also... think long and hard about what cures you use in soil ... if you plan on eating the fruit ... many things to ponder.. and i would also defer to the citrus peeps ... but one thing for sure .... WATERING IS NEVER A SCHEDULE thing ... you water when it needs water.. and most trees like the media to nearly dry before you water again ... insert finger and find out.. or learn to do it by weight of pot ... get this.. the thing that happens.. when the media doesnt dry enough.. is you get weird bugs living in the media.... and that might be right where you are right now ... so though you think the issue is the media... the root cause.. might be your watering .... [there is almost a root pun there] i wish you luck ... ken ps: now the real .. next question is... have you ever grown a tree indoors???? .... it might be a wild ride ... especially if you are up north.. in the great white north... and have a forced air furnace ... and that again.. is where watering might become a nightmare ... besides indoor humidity issues in winter .... one thing for sure.. your outdoor summer watering schedule.. will be near useless indoors .... this is where it gets real hard.. if you havent figured that out yet.. lol ....

That fruit condition is most commonly caused by broad mite damage when the fruits were very small; they are most likely gone now, as they usually attack when the new leaf growth is very small. Mites especially like conditions that are dry and dirty (dusty); a good spraying with water once a week goes a long way to controlling mites; but when you have an infestation, there are sprays you can use to help. You will need a 10X loupe to see these mites; look on the underside of the leaf. Signs you have mites on new growth usually include crinkled edges of the leaf.