How to prune geranium himalayense 'plenum'

Midsummer after flowering (typically June–July). Shear all stems to 5–10 cm from the ground after the double flowers fade. Water and apply a balanced feed to support strong regrowth. Remove remaining dead top growth in late autumn or early spring.

Once yearly. Geranium himalayense 'Plenum' (syn. 'Birch Double') has double violet-blue flowers and a similar growth habit to the species. Cut back hard after the midsummer flowering flush — shear to 5–10 cm to renew foliage. Because double flowers don't set seed, this is purely a tidy-and-renew cut rather than to prevent seeding.

Shear all stems to 5–10 cm from the ground after the double flowers fade. Water and apply a balanced feed to support strong regrowth. Remove remaining dead top growth in late autumn or early spring.