Hi folks. Can you help me figure out what's wrong with my tomato plants?? Three of the four have these problems. They're planted in separate, very deep containers. Symptoms:

* On older leaves: Brown edges bleeding into yellow.
* Stems turning yellow and falling off.
* Young leaves are small and weak.
* Plant is growing very slowly.
* Some of the flowers are shriveling and turning brown.
* The ripening tomatoes have yellow tops.

I've attached a picture of one of the leaves. Please help. This is driving me nuts.

try looking at these: http://www.haifa-group.com/kno...

It seems like maybe a nutritional deficiency of some kind maybe? Those are different kinds and examples of what that would look like in the link.

Maybe potassium?

Thanks. I thought Potassium too, so going to try adding fertilizers...

Are you growing these plants indoors or outside? What is your location/zone/climate/city/state?

Welcome to NGA, @invisiblegirl !

What type of growing medium is in your containers? Are the plants in full sun? Receiving adequate water? What is the temperature like where you are? (Lots of factors that can influence the health of your plants!) Might also be helpful if you could post a photo showing the entire plant.

Difficult to tell from the picture if it is a fungal issue or nutritional.

And are they getting adequate water in those containers? Containers can fool you; you think you're providing plenty of water, but it just all runs out the bottom.

How about a picture or two of the entire plants, please? We also need to know where you are on the planet, regarding what the weather has been like.

If you haven't used any fertilizer before, you really need to feed tomato plants a lot so that is your weak, yellow, slow growth problem. These are heavy feeders that need lots of water, especially in containers. Sometimes my tomatoes need deep watering twice a day in hot weather.