recent re-pot? maybe some of your native soil had weed killer in it or other nasties. a slight breeze can also carry weed killer pretty far. a small dose of overspray could cause a slow death (slow compared to direct application).
are you watering with tap water? is it city or well? if city, it may have a high chlorine which might cause this with a heavy watering sched in your heat.
just some more thoughts. good luck.
are you watering with tap water? is it city or well? if city, it may have a high chlorine which might cause this with a heavy watering sched in your heat.
just some more thoughts. good luck.