Its foliage is evergreen in milder climates. Plant Name. Upwards of 50 species of annuals and perennials grow in … The growing patterns, leaf structures, interior stem, and pink flowers set this plant apart. Individual flowers are much bigger than those of Japanese knotweed and are clearly bell-shaped. Height: 2 to 135 inches (5 to 350 cm).Vines may grow up to 100 feet (30 M). Life Cycle: Hardy perennial. Plant database entry for Pink Knotweed (Persicaria capitata) with 13 images and 38 data details. Life Cycle: Half hardy annual, hardy annual.Half hardy perennial, hardy perennial. Himalayan knotweed (figure 6) grows to 6 feet tall. The pink flowers and lance-shaped leaves are a dead giveaway that you have found a Himalayan knotweed … Common Names: Knotweed, Bistort, Wiregrass, Tear Thumb, Knotgrass, Arssmerte, Mile a Minute, Smokeweed, Swamp Smartweed. Growing Region: Zones 3 to 9. Flowers: Middle of summer through to early autumn. They range in colour from pale to bright pink. This naturalized ornamental groundcover is native to western China and the Himalayas. Bohemian knotweed (figures 4 and 5) is a hybrid of Japanese knotweed and giant knotweed and has characteristics of both parents. Physostegia Growing and Care Guide. Spikes of flowers. Stems and flowers are similar to those of other knotweed species, though flowers are occasion-ally pink. Persicaria is a genus of herbaceous flowering plants in the knotweed family, Polygonaceae.Plants of the genus are known commonly as knotweeds: 436 or smartweeds. The flowers on Himalayan Knotweed have a pink hue, which distinguishes them from the pure white of Japanese Knotweed’s. A selection of variegated leaf forms are also available. The genus was segregated from Polygonum. Tubular. Height: 12 to 72 inches (30—210 cm). Native: Temperate regions of Europe and Asia. Lesser knotweed is shorter than Japanese knotweed, growing approximately 1.5m tall. Polygonum Plant Growing and Care Guide. Growing Persicaria (Bisort, Knotweed) Latin Name Pronunciation: per-si-kar'-ee-ah Members of this genus are sometimes included in Polygonum (known to many gardeners through the unwelcome guest called Knotweed). Native to China and the Himalayas, this plant is a member of the buckwheat or dock family. Pink Knotweed self seeds readily where climate permits (zones 8-9). Many forms turn red or bronze in autumn. Common Names: Obedient plant, False dragonhead, Correll's false dragonhead. Japanese knotweed may be more effective than antibiotics at tackling Lyme disease, new study has found. Unlike the other species, the Himalayan knotweed grows close to the ground, aiding in its dense nature. Green or reddish, simple oval, lance-shaped or elliptic leaves. Sometimes streaked. Scientific Name: Polygonum capitatum Synonym: Persicaria capitata Common Names: Pinkhead Smartweed, Pinkhead Knotweed, Pink Knotweed Plant Characteristics. Flower Details: Pink, purple. Native: Northern America. 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