Persicaria
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At-A-Glance InformationCommonly referred to as Knotweed, this genus of flowering perennial plants need full sun to partial shade and regular water. They are considered easy to grow, and have handsome foliage. Flowers come in shades of pink or white. Some species tend to get a bit out of hand if not controlled.
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Persicaria Species and Varietals
The best growing zones for Knotweed vary depending on the species. For more information, see the descriptions below. To find your zone, click here: Zone Map.
Persicaria affinis (Polygonum affine)
Best in zones 1-9 and 14-17, these Himalayan natives reach 1 foot tall and 2 feet or more wide. Leaves are deep green and turn bronze in cooler temperatures. Flowers are borne on spikes and are rose-red, blooming in early summer and fall. Varieties are listed below.
Best in zones 1-9 and 14-17, these Himalayan natives reach 1 foot tall and 2 feet or more wide. Leaves are deep green and turn bronze in cooler temperatures. Flowers are borne on spikes and are rose-red, blooming in early summer and fall. Varieties are listed below.
Persicaria amplexicaulis (Polygonum amplexicaule)
Grown in zones 2b-9 and 14-24, this species is native to the Himilayas and forms a 4 foot tall clump of foliage that is just as wide when in bloom. Profuse bloomer from the middle of summer through fall in colors including white, pink, purple and red. Varieties are listed below.
Grown in zones 2b-9 and 14-24, this species is native to the Himilayas and forms a 4 foot tall clump of foliage that is just as wide when in bloom. Profuse bloomer from the middle of summer through fall in colors including white, pink, purple and red. Varieties are listed below.
Persicaria capitata (Polygonum capitatum) Zones 8, 9 and 12-24, native to the Himalayas. This cool-weather loving plant forms a trailing groundcover 3-6 inches tall. Leaves are bronze when new, and mature to green blushed with pink. Stems and flowers are pink, and this plant will bloom year-round in mild climates. Best for containers, where it can't spread indefinitely and does not need irrigation, |
Persicaria vacciniifolia (Polygonum vacciniifolium) This plant grows in zones 4-7 and 15-17 and is native to the Himalayas. It forms a 3 inch tall mat that reaches 2 or more feet wide. Stems are reddish and leaves are shiny and green. Flowers rose-pink. Great as a bank or groundcover, and also good in rock gardens where it can trail over boulders. |
Persicaria virginiana (Polygonum virginianum, Tivara virginiana) This species is best in zones 2-9 and 14-17 and is native to the eastern areas of North America and Asia. It spreads by creeping rhizomes and is not commonly found in gardens. Variety 'Painter's Palette' is more common than the species and has marbled foliage. |
Caring for Persicaria
Propagation
Problems and Pests
Gallery
Videos
A video all about growing camellias successfully
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Propagating camellias
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Resources
The New Sunset Western Garden Book: The Ultimate Gardening Guide (2012) - Pages 494 - 495, Persicaria
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