How to prune persicaria bistorta 'superba'

Deadhead after first flush (early summer); full cutback in late autumn. Snip spent spikes at the base to encourage reblooming. In autumn, shear all foliage to just above ground. The plant spreads by rhizome — lift and divide congested clumps every 3–4 years.

Deadhead after first flush; full cutback once annually in autumn. Persicaria bistorta 'Superba' produces its soft pink poker flowers in early summer and often again in autumn. Cut spent flower stems back after the first flush to encourage a second flush. In late autumn, cut the whole plant back to ground level to clear old growth before winter.

Snip spent spikes at the base to encourage reblooming. In autumn, shear all foliage to just above ground. The plant spreads by rhizome — lift and divide congested clumps every 3–4 years.