These are heirloom tomatoes that my Uncle brought back from Italy years ago. I'm in Colorado and they go outside on warm days but always inside below 50° or so. Some leaves on lower branches of are curling downward into ball-like clumps and when I tried to straighten one out it's sort of cracked. I looked underneath to find that the vein on the underside has a woody look. Other flatter leaves have normal green veins.
Any idea what's causing them to grow up or any corrections I should make? They were transplanted relatively recently.
by Trabinist