Upwards of 50 species of annuals and perennials grow in … Flowers: Vertical, long-lasting heads of small red, white or pink flowers, on spikes or panicles. Green or reddish, simple oval, lance-shaped or elliptic leaves. Unlike the other species, the Himalayan knotweed grows close to the ground, aiding in its dense nature. Common Names: Knotweed Foliage: Deciduous. Flowers: Middle of summer through to early autumn. Polygonum Plant Growing and Care Guide. They range in colour from pale to bright pink. Height: 2 to 135 inches (5 to 350 cm).Vines may grow up to 100 feet (30 M). Life Cycle: Hardy perennial. 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 genus was segregated from Polygonum. Native: Temperate regions of Europe and Asia. Plant Name. Its foliage is evergreen in milder climates. It has a cosmopolitan distribution, with species occurring nearly worldwide. Tubular. A selection of variegated leaf forms are also available. Many forms turn red or bronze in autumn. One of the most invasive weeds in the world, Japanese knotweed is native to Asia, where it is regarded as having medicinal value. Japanese knotweed may be more effective than antibiotics at tackling Lyme disease, new study has found. Leaves are a thin triangle between 4 and 8 inches long. The pink flowers and lance-shaped leaves are a dead giveaway that you have found a Himalayan knotweed … Native to China and the Himalayas, this plant is a member of the buckwheat or dock family. Flower Details: Pink, purple. Lesser knotweed is shorter than Japanese knotweed, growing approximately 1.5m tall. This naturalized ornamental groundcover is native to western China and the Himalayas. 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). Spikes of flowers. Common Names: Knotweed, Bistort, Wiregrass, Tear Thumb, Knotgrass, Arssmerte, Mile a Minute, Smokeweed, Swamp Smartweed. It was introduced to North America in the 1870s as an ornamental and forage plant. Individual flowers are much bigger than those of Japanese knotweed and are clearly bell-shaped. Pink Knotweed (Persicaria capitata) - Garden.org New and Unread Tree-Mails The growing patterns, leaf structures, interior stem, and pink flowers set this plant apart. Life Cycle: Half hardy annual, hardy annual.Half hardy perennial, hardy perennial. Common Names: Obedient plant, False dragonhead, Correll's false dragonhead. Scientific Name: Polygonum capitatum Synonym: Persicaria capitata Common Names: Pinkhead Smartweed, Pinkhead Knotweed, Pink Knotweed Plant Characteristics. Height: 12 to 72 inches (30—210 cm). Flowering Period: Early summer to autumn. Stems and flowers are similar to those of other knotweed species, though flowers are occasion-ally pink. Himalayan knotweed (figure 6) grows to 6 feet tall. Sometimes streaked. Native: Northern America. Pink Knotweed self seeds readily where climate permits (zones 8-9). The flowers on Himalayan Knotweed have a pink hue, which distinguishes them from the pure white of Japanese Knotweed’s. Plant database entry for Pink Knotweed (Persicaria capitata) with 13 images and 38 data details. Growing Region: Zones 3 to 9. Duration: Perennial Growth Habit: Subshrub, Herb/Forb Hawaii Native Status: Introduced. Lipp Physostegia Growing and Care Guide. 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