Pruning threadleaf coreopsis
Advice for October in the Netherlands
Threadleaf coreopsis mainly needs dead growth tidied away. Summer trimming is optional and must not indiscriminately remove living flower buds. Months are a guide for the Netherlands and Belgium; follow actual growth and flowering.
Threadleaf coreopsis — October
Check this first
Retain coreopsis’s fine green foliage and flowering heads. Outside flowering, no deadheading is needed; brown stalks may remain until the spring tidy-up.
Pay attention to this
- Keep the fine green leaves below faded heads intact.
- Do not cut back the whole clump while many unopened buds remain.
- During spring tidying, cut above visible new shoots, not through them.
Frequently asked questions
- Must I deadhead coreopsis every week?
- No. With Coreopsis verticillata, deadheading is mainly a choice; remove unsightly faded heads and let a well-flowering plant continue.
- Can old growth remain through winter?
- Yes, if healthy and upright. Remove brown remains in spring before new shoots become entangled in them.
- Does this apply to every Coreopsis?
- This advice is for perennial Coreopsis verticillata. Annual coreopsis and other species do not automatically share this calendar.