How to Stop Yellow Leaves on Tomatoes

Question

I started a new box garden on the north side of my home. I have planted some tomato plants, but now they are getting yellow leaves with brown spots. What can I do to stop this?

Answer 1

For now, treat it as a watering or nutrient issue. This article will help you determine which it is:
https://www.gardeningknowhow.com/edible/vegetables/tomato/yellow-tomato-leaves.htm

But be aware that this is also a sign of a bacteria. It will kill the plant if it has been infected, but I would not assume it was this until after you have tried to reverse the yellow leaves though watering and fertilizing. Here is more info on the bacteria:
https://www.gardeningknowhow.com/edible/vegetables/tomato/early-blight-alternaria-tomato-leaf-spots-yellow-leaves.htm