I have four tomato plants in my garden. It has been in the upper 80's the last three days here in SW Wisconsin. Three of the four are doing well, but one of the plants, an heirloom, has been wilted the last couple of days. It is even wilted in the morning. The other three wilt just a bit with the sun, but rebound by the next morning. The plant has five fruit on one limb that are about .5"-1" in diameter and still very green. They don't seem to have suffered any ill effects yet.
I've tried providing it with extra water the last couple of days, but it doesn't seem to help by the morning. Does anyone know if it is just the heat or could there be something else affecting the plants?