Pennsylvania Smartweed - 25 Plants

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Height at Maturity:

Under 3 Feet

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5-7 Days



Pennsylvania Smartweed Persicaria pensylvanica

Pennsylvania Smartweed: Persicaria pensylvanica, formerly Polygonum pensylvanicum, is best known as the Pennsylvania smartweed. This plant is a colorful North American native flowering herb--a close relative to buckwheat. It is an annual species that grows from seed each year in almost all USDA plant hardiness zones. The sunlight preference of this herb is partial sun to full sun. While it will grow in the shade, the flowers will not form or blossom without sufficient light.

The Pennsylvania smartweed grows in a wide range of unlikely locations in the wild, including in the standing water of swamps or storm ditches or across open fields and prairie lands. It flourishes in harsh growing conditions that challenge most other flowers.

How to Use Pennsylvania Smartweed in Your Landscape

This flowering herb adds natural beauty and charm in a variety of settings, like these:

  • Rock garden
  • Shade garden (in a partially shaded spot)
  • Natural area
  • Water Garden
  • Pond
  • Native species garden

This wildflower requires a minimum of one inch of water every week, especially during the hottest days of the summer.

The Pennsylvania Smartweed Is a Charming Wildflower

The Pennsylvania smartweed is a wildflower with effortless, casual beauty. It reaches a mature height of 18 to 36 inches and features a smooth, upright, sturdy, brown, or burgundy stem.

The leaves of the plant alternate up the stem and are between four to six inches long, oval, and three inches wide. They are glossy, dark green, and form a lance shape with tiny hairs around the edges.

The flowers usually present as pink to burgundy, although they may also be dark red. The multiple blossoms form a spiked shape measuring about three inches tall. These blooms appear from the middle of summer until the first kiss of frost in the fall.

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