I have several potted tomato plants (I live in a 4th floor balcony apartment) that were planted 4 months ago that were beautiful and healthy and recently the leaves have begun yellowing. They then withered and the plants died. And now, several other plants that are quite young are beginning to wilt and die: watermelon plants, squash plants, thyme and cilantro. They almost seem to rot at the base or root. I haven't changed how I water or fertilize the plants and there doesn't seem to be any insect or larvae infestation. I've planted new seeds only to have them grow healthy for a few weeks and then wither. What would be causing this? What should I do differently?
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