perennials winter care?
I'm not planning on lifting any of these plants, so wondered if someone could advise on when and how to prepare these for winter in terms of cutting back and covering them? I know some are hardy and some not. Thanks in advance.
Veronica - is this hardy?
Verbena bonariensis - how much to cut back and when? cover?
Dahlia bishop of llandaff - as above
Aster x frikartii - as above
Aster novi belgii - as above
Geraniums - left to die back naturally? Are they then cut to the ground in spring?
Delphiniums - same as above?