I have a potted clementine tree which I thought was doing really well (fresh growth, new leaves, lots of flowers), but now, all of the budding fruit is turning black and falling off :( (I'm not even sure if I can even call it fruit, as they're roughly 1/2 the size of a pea - they start out round and green, but then dry up, turn black, and fall off without developing further). Any idea what could be causing this? The tree is right next to a sunny window, and in one of those self-watering containers where you pour the water into a tray at the bottom of the pot, and then it gets taken up through the soil.
