Oddly, at the very end of Nov. there is still abundant fresh green foliage on my foxgloves (OK, I know that's not a perennial), centaurea montana, poppy, and rudbeckia. Should I cut it back, or leave it there for the winter? I thought of leaving the foliage so it can continue to absorb sunlight and do the photosynthesis thing - but if the plant _should_ go dormant, that would hinder it?
Any advice from you experienced gardeners? thanks in advance!
I've heard perennials which are marginally hardy for your zone will overwinter better if foliage isn't cut back until late winter / early spring.
I don't bother cutting mine back, but just out of laziness, not out of conviction.
Some things (like roses) you need to prune sometimes to force them to go dormant. Others (like the subshrubs rosemary and lavender) are stimulated to grow when you cut them, so you shouldn't do it until spring when the new growth won't be damaged by frost.
I'd be inclined to leave them unless you've heard specifically that they need a cutting . . .
Many plants, like foxgloves, shasta daisies, mums, and more will develop basal foliage in late summer and fall which should be left alone. I agree that the best thing to do when in doubt is to leave anything green alone for the winter. Just cut back to healthy foliage in the spring. It'll be obvious then what to leave and what to prune!
Me either. First of all, I really don't have time. And I like to leave the leaves for winter protection. I clean off dead leaves in the spring when I see new growth, weed around them, put some fertilizer down. All in one fell swoop.
It's a year later and I just logged in to post this question - and saw that I'd asked it last year! I'm amazed at how much green foliage I still have at the end of November. The only thing really brown is Joe Pye (Gateway), and Autumn Joy sedums. Looks like all I should cut back is the stems & leaves on anything that has turned brown, and I'll cut back the iris (many of their leaves are still green, but I'm concerned about borers).
Should I do anything with astors to put them to bed, so to speak, for winter?
Thanks for any advice.
- Jan (Zone 6)
Wait to cut Iris leaves. I think I asked about iris on the iris forum or maybe an iris member who said the plants look ratty all winter but take off really brown and dried leaves in spring. Iris are putting up their new parts ( increases) now.These will be blooms next season. Cutting them will eleminate blooms .
As for everything else.I cut me asters when they stop blooming anf the bottom leaves are dead about halff way up the stems. Sedums are cut too.