Polygonum amplexicaule
syn. Persicaria amplexicaulis
Knotweed, Mountain Fleece, Smartweed
Knotweed, Mountain Fleece, Smartweed
Type Perennial
Hardy range 5B to 9A
Height 24" to 5' / 60cm to 1.60m
Growth rate Fast
Form Upright or erect
Exposure Full sun
Hardy range 5B to 9A
Height 24" to 5' / 60cm to 1.60m
Growth rate Fast
Form Upright or erect
Exposure Full sun
Bloom Color Pink, purple, red and white
Bloom Time Summer and Fall
The flowers are showy.
Bloom Time Summer and Fall
The flowers are showy.
Environment
This plant will grow in moist soil.
Suitable soil is well-drained/loamy or sandy.
The pH preference is a neutral soil.
This plant will grow in moist soil.
Suitable soil is well-drained/loamy or sandy.
The pH preference is a neutral soil.
Leaf Color Green
Fall Color No change in fall color
This plant has attractive foliage.
Fall Color No change in fall color
This plant has attractive foliage.
Culture Notes
This plant grows best where summers are not too hot and winters are not extremely cold. It produces slender spikes of red flowers in summer. The name knotweed comes from the fact that the stem of this plant has swollen nodes. This is considered a dwarf Polygonum species.
This plant grows best where summers are not too hot and winters are not extremely cold. It produces slender spikes of red flowers in summer. The name knotweed comes from the fact that the stem of this plant has swollen nodes. This is considered a dwarf Polygonum species.