Persicaria

Persicarias are resilient, long-blooming perennials known for their slender spikes and architectural foliage. Flowering from midsummer into autumn, they bring lasting colour to borders, meadows, and naturalistic planting schemes.

FAQs

What are Persicaria and why are they called long-flowering perennials?

Persicaria (formerly Polygonum/Bistorta) are hardy perennials known for their long-lasting flower spikes, typically from July through October, with vibrant hues of pinks, reds, coral & pastels.

Are Persicaria invasive or difficult to contain?

While not usually considered invasive, vigorous clump-formers like Bistorta amplexicaulis or P. affinis can spread and dominate if unchecked.

Containment tips:
Divide every 3–4 years to rein in size
Split clumps in autumn or early spring
Combine with other vigorous prairie plants (asters, grasses) to create balanced plantings

How and when should I divide or deadhead Persicaria?

Division: Best done in autumn or early spring; every 3–4 years is ideal to prevent overcrowding

Deadheading: Removing spent spikes tidies the plant and may encourage more blooms

Cut back: Trim foliage in late autumn (cut stems ~3 cm above soil) or early spring before new growth

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