Alpine knotweed Persicaria alpina

ABOUT
P. alpina is a tall semi-evergreen, perennial to 1.8m in height with large lance-shaped green leaves and strong stems bearing plumes of small creamy-white flowers in summer, followed by pinkish-red seed heads in late summer
About this plant
Names
Family
Polygonaceae
Synonyms
alpine knotweed
Common names
Polygonum polymorphum, Persicaria polymorpha
Toxicity
Contact with all parts may irritate skin, the sap may cause mild stomach upset if ingested. Wear gloves and other protective equipment when handling
Characteristics
Foliage type
Semi-evergreen
Height
1.5-2.5 metres
Spread
1-1.5 metres
Hardiness zones
H6
Light
Full Sun, Partial Shade
Pruning
Cut back after flowering
Soil
Loam, SoilClay
Suitable locations
Hardiness zone
Low Maintenance Drought Resistant Cut Flowers Flower borders and beds Hedging & Screens Wall-side Borders City & Courtyard Gardens Cottage & Informal Garden Prairie Planting Rock Garden Gravel Garden
Propogation
Propagate by division in spring or autumn or propagate by seed in spring
Pests
Generally pest free
Diseases
Generally disease free