pssst I was looking in the indoor/outdoor bible and stumbled on this;
"Big ridges between veins along with curled leaf fringes signify temperature strees coupled with salt buildup"
also;
"Leaf fringe standing up - Leaf fringes that point up mean the leaf is trying to dissapate as much moisture as possible,but it is unable to. This could be caused by toxic salt buildup,lack of water, or heat stress"

that might be the deepened ridges, might not have a good day