My lower tomato leaves are also yellowing. Is that bad? I find that the yellowing leaves allow me to find the tomato tags to identify the varieties.
Those yellow leaves are from too much water! I need to build that area of the garden up a foot or so for the next years crop. That row of maters are the beefsteak, yellow lower leaves or not, they are LOADED with fruit!
The older leaves on the bottom of my tomato plants yellowed over time as well. Didn’t seem to affect the rest of the plant.