All For Gardening: Any thoughts on what could be causing this? It’s a Husky Cherry Tomato that formerly looked and acted perfectly healthy. I’ve harvested numerous tomatoes from it. Now the leaves are stiff to the touch and almost have a purple hue to them. I’m in south Florida if that matters.

Any thoughts on what could be causing this? It’s a Husky Cherry Tomato that formerly looked and acted perfectly healthy. I’ve harvested numerous tomatoes from it. Now the leaves are stiff to the touch and almost have a purple hue to them. I’m in south Florida if that matters.