@Humanrob, damn, Man, tough break on your weather. We've been enjoying 85'F weather here in the mid-valley, so I had no idea you were still getting moisture in the gorge. Bummer.
If it's any consolation, my Durban Poisons have gone sideways as well. Following conventional wisdom and advice from our Extension Office and Master Gardners, I mulched around my girls with coffee grounds that I'd picked up from the familiar Starbucks bin. 2 Days later they were watered in during my weekly watering. The next day, all my tops look like this:
View attachment 4374801
and they remain like that for the past week. All young leaves are "cupped" and growth has stopped. Extensive google research has yielded little in the way of real science on the actual effects of coffee grounds -- or of specific concern, caffeine -- on plants, but there is some strong evidence that coffee grounds in the garden is not a good idea.
My 2 Durbans are most severely affected. I've tried removing the top inch of soil, flushing, ACT, etc., but nothing seems to help. Right now, I'm expecting to lose both plants, and *maybe* get a small yield from the remaining 2 plants that aren't thriving, but seem to be doing OK.
Anywho, if anyone has any suggestions on how to treat this, I'm all ears.