Knotweed

Persicaria Affinis 'Superba'

Design with this plant

Overview

Persicaria affinis 'Superba', also known as knotweed, is a robust, mat-forming perennial. It features dense spikes of tiny pink flowers that deepen to red, blooming from mid-summer to fall. With a height of 8-12 inches and a spread of 18-24 inches, its lush, elliptical leaves turn bronzy-green in fall. This low-maintenance ground cover thrives in Zones 4-9, preferring full sun to partial shade and moist, well-drained soil. Ideal for borders or slopes.

Sun Full, HalfWater Extra in Summer, MediumZones 4–7Climate Alpine

Knotweed (Persicaria Affinis 'Superba') — Persicaria affinis 'Superba', also known as knotweed, is a robust, mat-forming perennial

Culture

Sun: Full, Half
Water: Extra in Summer, Medium
USDA zones: 4–7

Shape & size

Mature height: 0.5–1 Ft.
Mature width: 1–2 Ft.

Classification

Family: Liliaceae
Climate: Alpine

See full data, regional cultivation notes, full-resolution photos, and design tools. Build a client presentation around this plant.

Start your 14-day trial

Photos (116)

Knotweed (Persicaria Affinis 'Superba') — spreading groundcover that adds an eclectic charm to any garden scape; pink flowers that gradually deepen, image 50

Knotweed (Persicaria Affinis 'Superba') — with the added interest of taking on a bronzed to verdant red palette as the temperatures drop, image 55

Knotweed (Persicaria Affinis 'Superba') — These blossoms are perched atop short stalks that rise modestly above the foliage; it is a delightful, image 54

Knotweed (Persicaria Affinis 'Superba') — pink flowers that gradually deepen to a rich crimson as summer progresses into fall, image 53

Knotweed (Persicaria Affinis 'Superba') — One of the key features of the Knotweed is its dense clusters of tiny; elliptical leaves turn, image 52

Knotweed (Persicaria Affinis 'Superba') — making it versatile across many climates; it is a delightful choice for gardeners looking for a, image 51

Knotweed (Persicaria Affinis 'Superba') — Ideal for borders or slopes; elliptical leaves turn bronzy-green in fall, image 49

Knotweed (Persicaria Affinis 'Superba') — With a height of 8-12 inches and a spread of 18-24 inches; it is a delightful choice for gardeners, image 66

Knotweed (Persicaria Affinis 'Superba') — It features dense spikes of tiny pink flowers that deepen to red, blooming from mid-summer to fall; pink, image 65

Knotweed (Persicaria Affinis 'Superba') — Persicaria affinis 'Superba', also known as knotweed, is a robust, mat-forming perennial; elliptical, image 64

Knotweed (Persicaria Affinis 'Superba') — ground cover / perennial for full or half; it is a delightful choice for gardeners looking for a, image 63

Knotweed (Persicaria Affinis 'Superba') — ground cover / perennial with pink and red blooms; pink flowers that gradually deepen to a rich crimson, image 62

Knotweed (Persicaria Affinis 'Superba') — pink and red flowers in the garden; elliptical leaves turn bronzy-green in fall, image 61

Knotweed (Persicaria Affinis 'Superba') — It is a delightful choice for gardeners looking for a groundcover that offers both beauty and practicality, image 60

Knotweed (Persicaria Affinis 'Superba') — or as a stabilizing force on sloped terrains; pink flowers that gradually deepen to a rich crimson as, image 59

Knotweed (Persicaria Affinis 'Superba') — consider using it for borders; elliptical leaves turn bronzy-green in fall, image 58

Knotweed (Persicaria Affinis 'Superba') — When integrating Knotweed into a design; it is a delightful choice for gardeners looking for a, image 57

Knotweed (Persicaria Affinis 'Superba') — This autumnal color transition creates a multi-seasonal display that enriches the garden's aesthetic, image 56

Knotweed (Persicaria Affinis 'Superba') — This low-maintenance ground cover thrives in Zones 4-9; pink flowers that gradually deepen to a rich, image 68

Knotweed (Persicaria Affinis 'Superba') — preferring full sun to partial shade and moist; it is a delightful choice for gardeners looking for a, image 69

Knotweed (Persicaria Affinis 'Superba') — elliptical leaves turn bronzy-green in fall, image 67

Knotweed (Persicaria Affinis 'Superba') — These blossoms are perched atop short stalks that rise modestly above the foliage; it is a delightful, image 75

Knotweed (Persicaria Affinis 'Superba') — making it versatile across many climates; it is a delightful choice for gardeners looking for a, image 72

Knotweed (Persicaria Affinis 'Superba') — spreading groundcover that adds an eclectic charm to any garden scape; pink flowers that gradually deepen, image 71

Related plants

Silver Leaf Astelia (Astelia Chathamica) — is a striking New Zealand native with elegant

Silver Leaf Astelia

Astelia Chathamica

Half · Zones 9–10

Red Hot Poker (Kniphofia Uvaria) — commonly known as the Red Hot Poker

Red Hot Poker

Kniphofia Uvaria

Full · Zones 5–10

'Waterslide' Hosta (Hosta hybrid) — Proven Winners - Shadowland® 'Waterslide' - Hosta hybrid purple lavender plant details

'Waterslide' Hosta

Hosta hybrid

Flamenco Red Hot Poker (Kniphofia Uvaria 'Flamenco') — Flamenco Red Hot Poker (Kniphofia uvaria 'Flamenco') dazzles with fiery spikes

Flamenco Red Hot Poker

Kniphofia Uvaria 'Flamenco'

Full · Zones 5–9

Giant 'Lone Star' Hosta (Hosta hybrid) — This Proven Winners® hosta grows 26-28 inches tall and spreads 50-56 inches, creating a broad, lush presence

Giant 'Lone Star' Hosta

Hosta hybrid

Royal Purple Lily Turf (Liriope Muscari 'Royal Purple') — The Royal Purple Lily Turf (Liriope muscari 'Royal Purple') is an ornamental grass-like perennial

Royal Purple Lily Turf

Liriope Muscari 'Royal Purple'

Half · Zones 6–10