DavidLMO said:@sooby My conclusion as well Sue. Did you ever figure out what the problem was with your Oleander?
.
I just put it down to cold and didn't really give it much thought until the topic came up here. It was outside past my low temperature threshold for bringing it in because the forecast was wrong and it got way colder that night than it was supposed to. Supposedly oleander can take down to 20F (-7C), albeit with possible damage, or thereabouts so I usually bring it in to at least the enclosed unheated porch when it is forecast to be -5C or worse. Poor thing had the same happen another night and that time the leaves were so badly damaged that I've pruned it back, otherwise I'd be able to post a picture.
According to an article back in 2002, anthocyanin pigments can accumulate in leaves for various reasons, such as UV exposure, injury, pathogens, high light, cold, pollution, osmotic stress and nutrient deficiency:
The functional role of anthocyanins in leaves:
https://researchspace.auckland...
