How do I stop brown spots from forming on my tomatoes?
Thanks for writing. It sounds like blossom-end rot, a common problem. Blossom-end rot usually shows up in hot weather and is often tied to inconsistent moisture levels --- where the plant stays wet for a while, then dries out, then gets wet again. Even watering can help prevent it, as can cooler temperatures.
Do you fertilize your tomatoes? Using too much plant food at one time can also cause it.
---Justin, Senior Garden Editor, BHG.com "