"Whilst some dormant perennials, such as buddleia, roses, lavender and summer-flowering spirea will all benefit from being cut back in January, other perennials, including echinacea or rudbeckia, form ...

Cut back perennials in fall if they’re disease-prone or pest-damaged. Wait until spring cleanup to give plants winter protection and wildlife value. Use sharp tools and clean, angled cuts for strong, ...