Mention the name Persicaria in horticulture circles, and you may raise a few eyebrows. Persicaria has a very bad cousin: Polygonum cuspidatum, commonly known as Japanese Knotweed or Running Bamboo (but it is not a bamboo!), and this cousin can spread DREADFULLY. But please read on…
Persicaria polymorpha is commonly called Giant Fleece Flower, and this common name describes it well. Within a few seasons, Persicaria polymorpha will reach 5′, maybe 6′ tall and form imposing clumps, increasing in width each season to 6′ or more. Talk about taking up space! In June and July, white Astilbe like plumes adorn the plant and the blooms seem to last and last. This is a great plant for a long distance view (think about its size and white color) and is memorable when viewed in the early evening light.
Here are the facts: Giant Fleece Flower likes average soil, or moist soil, or even very dry soil once established. It loves full sun but will grow in partial shade. It is a bold perennial and and adds contrast to the finer textured plants in your garden. Like Baptisia, it is one of the first herbaceous plants to attain good height in the spring. It is deer resistant and long lived. I have yet to discover seedlings about, although it can be propagated by seed. Persicaria polymorpha is hardy in zones 4-9.
Consider Persicaria polymorpha when you are in need of a big, bold, hardy, long blooming, deer resistant plant.