How to Prune Geranium pratense 'Marshmallow'?
Cut back after flowering to encourage the production of fresh leaves and flowers. Remove old dead foliage in spring before growth commences

Geranium pratense 'Marshmallow' · Geranium pratense 'Marshmallow'
Grow in any moderately fertile soil apart from waterlogged soils. Full sun or partial shade is best. Full shade is tolerated but may reduce flowering
Cut back after flowering to encourage the production of fresh leaves and flowers. Remove old dead foliage in spring before growth commences