How to Prune Chinese cranesbill?
Cut flowered stems and old leaves to the base to encourage new foliage and flowers

Chinese cranesbill · Geranium sinense
Grows best in part or full shade in moderately fertile, well-drained soil, but most soils (unless waterlogged) are tolerated. Especially good in damp shade
Cut flowered stems and old leaves to the base to encourage new foliage and flowers