It looks like a European plum that had too much heat this year. My Euro plums also look pretty ragged now, it was a rough August for them. Do watch it next year for signs of disease, there may have been some problem earlier. I had aphid problems which helped make my Euro plums ragged this year. Scott

You guys will want to protect your trees from freezing temps, even in the garage. To do that, you can set your plant on the garage floor and cover it with a cardboard box when there is any danger of the tree experiencing killing low temps. You should be able to leave the garage door open all night (if you're forgetful) with that protection down to temps as low as 20-25* w/o killing or badly damaging the tree. Al

You could try and prune it to a smaller size maybe if you wish to keep it in a smaller pot, my key lime is quite small and it went through several flowering cycles this year. Citrus are heavy feeders so providing enough nutrients is key. I use granular citrus fertilizer on a monthly basis just topdress the soil, and when my plants are fruiting and flowering I use a water soluble fertilizer weekly. They also make water soluble citrus nutrients which can be diluted and sprayed on the leaves. I prefer to apply smaller amounts of nutrients more often. Also I recommend using organic fertilizer, non organic fertilizer will lead to salt build up in the pot. The picture is the kinds of fertilizer I use. In the background you can see some key limes in my fruit basket.

Almost any container grower who's been around the fora for a while and is trying to improve their game understands very clearly that over-watering causes the hypoxia (lack of oxygen) that eventually causes root issues. If we wanted to parse words and start looking at plants at the cellular or molecular level, we could find a number of causes subsequent to hypoxia that could be labeled as causal, such that they would displace lack of oxygen as the cause of root death. If all free oxygen could suddenly be removed from the soil, the roots would still have access to the oxygen within root tissues and the oxygen dissolved in water. Kozlowski and Pallardy in "Growth Control in Woody Plants" list Citrus as moderately resistant to inundation (flooding). This means that roots don't die within minutes of the oxygen supply being cut off is clear evidence that root death is a process, so the actual cause of death when free oxygen is removed would not be the absence of free oxygen. Lack of oxygen causes cellular dysfunction, which leads to other factors at the cellular level that cause loss of viability. You can look at what I said in 2 ways, you can say, "Hmm - he has a point"; or, you can say he's full of it and grasping for straws, basing his argument on a technicality. Which way you look at it doesn't matter to me. The reason is, if you think I'm full of it for what I said, you need to consider the fact that Silica's position is exactly the same. I wouldn't be doing anything she hasn't done. She named a secondary effect and made it the primary cause. Would it not make much more sense to either really enlighten us and explain what happens at the cellular level as roots slowly die, also siting tertiary, quaternary ..... causes until you arrive at the site of cellular death; or, would it make more sense to stick with the primary cause of hypoxia, which is resultant of over-watering. Having too much air in the soil isn't the cause of under-watering, but you sure can end up with too little air in the soil by over-watering. Assuming you're using a medium appropriate for conventional container culture, can anyone name a cause, the effect of which would be too little air in the soil, other than over-watering? What has occurred is, one person decided to rephrase a concept that is a foundational underpinning of growing well in containers, that is known by millions and millions of growers and clearly understood, and rephrased it in such a way that it's contentious. Intentionally confusing cause and effect as support for any argument is a pretty clear indication of the tenuous nature of the claim. Al