Answer: You didn't say what kinds of tomatoes you are growing. There are two types - determinate and indeterminate. The determinate tomato type plants grow, develop fruit all at once and then die off. Indeterminate types continue to grow and produce all summer long. If you have a determinate type tomato, it may be dying because it has reached the end of its lifecycle. I suspect that's what you are growing because these are much smaller plants than indeterminate types and much more adapted to growing in containers (or topsy turvy planters).
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