Reynoutria compacta
Japanese Knotweed

Previously known as:  Fallopia japonica var. compacta, Polygonum japonicum var. compactum
 Plant Type:
 Hardiness:
 Deciduous / Evergreen:
 Flower Notes:
White (Fuzzy flowers July through September)
 Foliage Notes:
Green (Bright green summer foliage)
 Fruit Notes:
Red (Small and borne profusely; attractive)
 Ultimate Height:
2 feet
 Ultimate Spread:
8-12 feet
 Soil Notes:
Adaptable to poor, dry soils
 Range:
Japan
 Diagnostic Characteristics:
Alternate, simple, 3-6" long leaves are round to ovate, end in an abrupt point, and have crimped margins. Greenish-white flowers and small reddish-pink fruit together in pyramidal panicles in summer and fall.

Additional Information

Handsome groundcover with summer color. Adaptable to poor, dry soils. Just a root cutting stuck in poor soil will lead to an aggressive spreading groundcover. Spreads by underground stems; can be very invasive. Fall color not attractive (best to mow it down in the fall).

When Reynoutria compacta has been observed flowering or fruiting at Purdue University

Flowering

JanFebMarAprMayJunJulAugSepOctNovDec

Fruiting

JanFebMarAprMayJunJulAugSepOctNovDec

Other plants like this Reynoutria compacta (Japanese Knotweed)

The Purdue Arboretum is a collaboration between the Department of Horticulture and Landscape Architecture and Physical Facilities Grounds Department

Purdue Arboretum, 625 Agriculture Mall Dr, West Lafayette, IN, 47907
© 2024 Purdue University | An equal access/equal opportunity university | Integrity Statement | Copyright Complaints | Maintained by the Purdue Arboretum
Contact Purdue Arboretum at arboretum@purdue.edu for accessibility issues with this page | Accessibility Resources | Contact Us