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Polygonum

Common Name(s):

Phonetic Spelling
poh-lee-GON-um
Description

About 150 species of Knotweed or Smartweed are known, and most are weeds of disturbed, moist areas. They can be found in marshes, swamps, wet forests and ditches. 

The submerges portion of the plant provides habitats for many invertebrates, which in turn are food eaten by fish, reptiles, ducks, and amphibians.  Once the plant dies and decomposition begins, it again provides food for many aquatic invertebrates.

In the garden species and hybrids of Polygonum are interesting and beautiful with a long bloom season and compact or spreading growth forms.  

Cultivars / Varieties:
Tags:
#red#white#sun#perennial#pink flowers#fall interest#NC native#summer flowers#wildflower garden
 
Cultivars / Varieties:
Tags:
#red#white#sun#perennial#pink flowers#fall interest#NC native#summer flowers#wildflower garden
  • Attributes:
    Genus:
    Polygonum
    Family:
    Polygonaceae
    Life Cycle:
    Perennial
    Recommended Propagation Strategy:
    Division
    Country Or Region Of Origin:
    Cosmopolitan
    Wildlife Value:
    Food and habitat source for fish and wildlife.
    Play Value:
    Wildlife Cover/Habitat
    Wildlife Food Source
  • Whole Plant Traits:
    Plant Type:
    Native Plant
    Perennial
    Habit/Form:
    Spreading
    Growth Rate:
    Rapid
  • Cultural Conditions:
    Light:
    Full sun (6 or more hours of direct sunlight a day)
    Soil Drainage:
    Moist
    NC Region:
    Coastal
    Mountains
    Piedmont
    USDA Plant Hardiness Zone:
    4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a
  • Fruit:
    Fruit Color:
    Black
    Brown/Copper
    Cream/Tan
    Red/Burgundy
    Fruit Description:
    The fruit can be light tan to reddish-brown to black in color. The fruit contains one seed. Roundish shape with bulging on two sides.
  • Flowers:
    Flower Color:
    Pink
    White
    Flower Inflorescence:
    Spike
    Flower Bloom Time:
    Fall
    Summer
    Flower Description:
    Small blooms from late summer to early fall that grow on terminal spikes.
  • Leaves:
    Leaf Color:
    Green
    Leaf Arrangement:
    Alternate
    Leaf Shape:
    Lanceolate
    Linear
    Hairs Present:
    No
    Leaf Description:
    Leaves are lance-shaped, narrow and willow-like. The leaf bases form a sheath around the stem.
  • Stem:
    Stem Is Aromatic:
    No
  • Landscape:
    Problems:
    Weedy