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Hardiness: USDA Zone 5a: to -28.8 °C (-20 °F) USDA Zone 5b: to -26.1 °C (-15 °F) USDA Zone 6a: to -23.3 °C (-10 °F) USDA Zone 6b: to -20.5 °C (-5 °F) USDA Zone 7a: to -17.7 °C (0 °F) USDA Zone 7b: to -14.9 °C (5 °F) USDA Zone 8a: to -12.2 °C (10 °F) USDA Zone 8b: to -9.4 °C (15 °F) USDA Zone 9a: to -6.6 °C (20 °F) USDA Zone 9b: to -3.8 °C (25 °F)
Sun Exposure: Sun to Partial Shade
Danger: N/A
Bloom Color: White/Near White
Bloom Time: Mid Summer
Foliage: Deciduous
Other details: Average Water Needs; Water regularly; do not overwater
On Jul 17, 2008, mdeano from Monticello, MN (Zone 4b) wrote:
This plant has grown very successfully in my zone 4 garden on the north side of my home in almost complete shade. It has grown larger but not moved from it's own clump. Very beautiful. I am planning on dividing the clump this fall and spreading it out along the whole wall. Flowers last for almost a month!
On May 3, 2008, runningdeer from River Falls, WI wrote:
This plant is an awesome performer in my garden. I have it in the back of the garden in part sun/ part shade with a large evergreen as a backdrop. It grows to about 5 feet in height and about 5 feet in width. I have day lilies at the base of this plant but I must move them this year because I am unable to see them very well because the girth of this plant.
It's very fun to watch this plant take shape because I swear it grows at least 5 inches a day!
On Oct 8, 2007, reinbeau from Hanson, MA (Zone 6a) wrote:
My mother has this in her zone 6a garden three miles from me, and it is a beauty! It behaves itself, hasn't propogated itself beyond the clump it's growing in, and is a wonderful backdrop plant planted against her retaining wall.
On Feb 20, 2006, rcn48 from Lexington, VA (Zone 6a) wrote:
Bold landscape plant with a shrub-like habit - excellent for a back border. Wonderful textured leaves with giant fluffy white astilbe-like blooms in early summer. One of Wolfgang Oehme's favorite plants!
On Feb 19, 2006, mountaindog from Phoenicia, NY (Zone 5a) wrote:
CatskillKarma is mistaken about this species of Persicaria, it is not the invasive Japanese Knotweed (see "Polygonum cuspidatum" in this database, previous scientific names of JP also include Polygonum sieboldii, Polygonum japonicum, Polygonum zuccharini Small, Pleuropterus zuccarinii, Polygonum reynoutria (in USA horticulture trade)).
Persicaria polymorpha is a clump-forming, non-invasive cultivar that is highly ornamental and grows very well in my zone 5a garden, looking like a giant white astilbe but grows in full sun. Looks stunning next to Siberian Iris, May Night Salvia, and Catmint.
On Jan 25, 2005, CatskillKarma from West Kill, NY wrote:
This knotweed is highly invasive and has become a big pest along the trout streams in the Catskills. Be very careful where you plant it, because you will never get rid of it. It is pretty but extremely aggressive.
On Jan 24, 2005, wendyem from Fredericton
() wrote:
This plant is hardy! It was pulled up accidentally by a contractor and left to die. I replanted it that evening and it seemed to die. Next spring however, it was back, bigger than ever, and last summer it was 6 feet tall and 6 feet wide! It's hardiness resulted in it being renamed "Butch"! It is quite beautiful and has done very well in our rocky soil and with only 4 or 5 hours of direct sunlight a day.
Regional...
This plant has been said to grow in the following regions:
Valrico, Florida Hanson, Massachusetts Monticello, Minnesota Phoenicia, New York West Kill, New York Page, North Dakota Ashland, Ohio Lexington, Virginia River Falls, Wisconsin
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