Stress And Leaf Spot

There are several things that cause tomato foliage to look like this and you may have more than one thing going on. 1. Uneven watering causes tomato leaves to curl and drying out in between waterings can cause edges to brown. This looks like the pot might be too small for so many tomato plants. Usually one tomato should be grown in a pot that is at least 18″ to 2′ in diameter and two feet tall. Smaller pots just won’t support their growth. 2. Leaf spot happens when a tomato is frequently splashed with water especially if the plant is watered in the evening so the leaves stay damp overnight. Try to water tomatoes without getting the leaves wet. 3. Another thing that causes browned edges is fertilizer burn. If you fertilize a thirsty plant (dry soil) the edges can brown. I’d suggest that you only put one tomato plant per pot and use a very large container completely filled with potting soil (no rocks or shards in the bottom!!) and be sure there are drainage holes that aren’t covered.