Tomato Plants Turning Brown

Question

I planted two tomato plants in a large container on my patio. I put a hole in the bottom of the pot, then some river rocks and then a 50/50 mix of potting soil and compost. My tomatoes were growing really well (plant is approx. 3′ tall) and we even saw about 8-10 tomatoes growing. All of a sudden the leaves were turning yellow and within about a weeks time, the branches are turning brown, like the plant is dying. The fruit is still on the plant and looks unaffected, but something is wrong and I’d like to try and save the plants.

Answer 1

The causes in this article may also apply to your tomatoes: https://www.gardeningknowhow.com/edible/vegetables/tomato/yellow-tomato-leaves.htm