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Persicaria is a genus of herbaceous flowering plants in the knotweed family, Polygonaceae. Plants of the genus are known commonly as knotweeds [ 2 ] : 436 or smartweeds . [ 3 ] It has a cosmopolitan distribution , with species occurring nearly worldwide.
The ideal day to divide a plant is when it is cool and there is rain in the forecast. [4] Start by digging a circle around the plant about 4-6 inches from the base. Next, dig underneath the plant and lift it out of the hole. Use a shovel, gardening shears, or knife to physically divide the plant into multiple "divisions".
Persicaria lapathifolia (syn. Polygonum lapathifolium), known as pale persicaria, [2] is a plant of the family Polygonaceae. It is considered to be native throughout most of the world, from arctic to tropical realms, except South America and Southern Africa. [ 3 ]
Persicaria orientalis is a species of flowering plant in the family Polygonaceae, [1] known as kiss-me-over-the-garden-gate and princess-feather. [2] It was first described, as Polygonum orientale, by Carl Linnaeus in 1753. It was transferred to the genus Persicaria by Édouard Spach in 1841. [3] Its native distribution is unclear. [4]
Koenigia weyrichii (synonym Persicaria weyrichii), [1] the Chinese knotweed [2] or Weyrich's knotweed, is a large, perennial, rhizomatous herb native to East Asia. It is one of the parents of the cultivated hybrid Koenigia × fennica , the other being Koenigia alpina .
Persicaria runcinata is a species of flowering plant in the family Polygonaceae, native from the Himalayas east through mainland China to Taiwan and south to Java and the Philippines. [1] It was first described in 1825 as Polygonum runcinata .
Persicaria longiseta is an annual herb with stems 30 to 80 centimeters (12–32 inches) long, [5] sometimes reaching one meter (40 inches). [3] The hairless, branching stems may root at lower nodes that come in contact with the substrate. The leaves are lance-shaped and up to 8 centimeters (3.2 inches) long by 3 cm (1.2 inches) wide.
Bistorta affinis (synonyms Polygonum affine, Persicaria affinis), the Himalayan bistort, [2] fleece flower, or knotweed, is a species of flowering plant in the family Polygonaceae, native to the Himalayas (Tibet, Nepal, northern India, Pakistan, Kashmir).