I'm trying to cultivate asclepius (orange flowers) in a relatively sandy, very well drained and sunny area - but it's a field. This has worked well in a similar area, but in this place they keep getting yellow leaves. No spots that I can see, just the yellowing, and if this progresses the leaves fall off. Any idea what this is or what I should do?
TIA
LAS
Yellowing leaves on asclepius
Probably it's caused by heat fluxation - mine is doing the same thing.