Dumb, Rookie Mistake...
Well, either y'all are all going to get a good laugh out of this (no problem...I deserve it...), or one or two of you may empathize (but it's OK if you're not willing to own up to it).
Out in the rock-ish garden by the mailbox, I had Nana Coreopsis last year and it rotted when the temps got really high. So did the sedums. I just left them there...partly out of disgust and partly because I was too busy on other parts of the house and garden and figured I'd deal with it in the late winter. OK, it's late winter and I just went out to get some clean-up going and saw those black, greasy, coreopsis leaves and pulled 'em all right up. They came up VERY easily and all in pretty much one clump, so I was very proud of myself that I'd done this "great" thing.
Until I was throwing them on the compost heap and happened to notice the second "tier" of leaves under all of the greasy black ones.
Just as green as green could be.
I am new to perennials. I'm used to lantana and pincushion flower, but that's about it. I had never seen a perennial get all black and greasy-looking like that. The things I'm used to get woody or just die back, but don't look rotted.
Anyway, I'm sick about it...not much money wasted, but time and effort gone and figured if I came clean here on the Forum, at least it would be cathartic.
Dumb, rookie mistake...