How to prune iris 'clarence'

Deadhead after flowering in late spring to early summer; cut foliage back in autumn or late winter. Snip spent flower stems to the base. In autumn after foliage yellows, or in late winter before growth resumes, cut the whole clump of leaves down to 4–6 inches with secateurs or shears.

Deadhead as needed; cut back foliage once annually; divide clumps every 4–5 years. Iris 'Clarence' is a Siberian iris, which is lower-maintenance than bearded types. Deadhead faded blooms to prevent self-seeding if desired, though it is not essential. Cut the entire clump of foliage back to about 4–6 inches in autumn or late winter. Divide congested clumps every 4–5 years to maintain vigour.

Snip spent flower stems to the base. In autumn after foliage yellows, or in late winter before growth resumes, cut the whole clump of leaves down to 4–6 inches with secateurs or shears.