Marshpepper Knotweed (Hydropiper)
The
Marshpepper Knotweed (Hydropiper) is generally described as
an annual forb/herb.
This
is
not native to the U.S. (United States)
and has its most active growth period in the
summer .
The greatest bloom is usually observed in the
late spring,
with fruit and seed production starting in the
summer and continuing until
fall.
Leaves are
not retained year to year.
The
Marshpepper Knotweed (Hydropiper) has a
short life span relative to most other plant species and a
rapid growth rate.
At maturity, the typical
Marshpepper Knotweed (Hydropiper) will reach up to
1.6 foot high, with a maximum height at 20 years of
0 inches.
The
Marshpepper Knotweed (Hydropiper) is easily found in nurseries, garden stores and other plant dealers and distributors. It can be propagated by
seed.
It has a
moderate ability to spread through seed production and the seedlings have
high vigor.
Note that cold stratification is
not required for seed germination and the plant cannot survive exposure to temperatures below
52°F.
has
none tolerance to drought and restricted water conditions.
| Category |
|
| Growth Rate |
Rapid |
| General Type |
Forb/herb |
| Growth Period |
Summer |
| Growth Duration |
Annual |
| Lifespan |
Short |
| Plant Nativity |
Introduced to U.S. |
| Commercial Availability |
Routinely Available |
| Bloom Period |
Late Spring |
| Displays Fall Colors |
No |
| Shape/Growth Form |
Single Crown |
| Drought Tolerance |
None |
| Shade Tolerance |
Intolerant |
| Height When Mature |
1.6 |
| Vegetative Spread |
None |
| Flower Color |
Red |
| Flower Conspicuousness |
No |
| Fruit/Seed Abundance |
High |
| Fruit/Seed Seasonality |
Summer Fall |
| Seed Spread Rate |
Moderate |
| Propagations (Ways to Grow) |
Seed |
| Moisture Requirements |
High |
| Cold Stratification Required |
No |
| Minimum Temperature |
52 |
| Soil Depth for Roots |
6 |
| Toxic to Nearby Plants |
No |
| Toxic to Livestock |
No |
| After-Harvest Regrowth Rate |
Slow |
| After-Harvest Resprout Ability |
No |
| Responds to Coppicing |
No |
| pH Range |
5–7.5 pH |
| Precipitation Range |
24–24 inches/yr |
| Planting Density |
0–0 indiv./acre |
| Soil Textures |
Coarse, Fine, Medium |
| Soil Depth for Roots |
6 |
| Minimum Frost-Free Days |
120 day(s) |
| Salinity Tolerance |
None |
| CaCO3 Tolerance |
Low |
| Leaf Retention |
No |
| Fire Resistant |
No |
| Causes Livestock Bloating |
None |
Source: USDA, NRCS, PLANTS Database, plants.usda.gov.
National Plant Data Center, Baton Rouge, LA 70874-4490 USA
- Persicaria hydropiper
- Polygonum hydropiper var. projectum
can be found in
Alaska, Alabama, Arkansas, California, Colorado, Connecticut, District of Columbia, Delaware, Florida, Georgia, Hawaii, Iowa, Idaho, Illinois, Indiana, Kansas, Kentucky, Louisiana, Massachusetts, Maryland, Maine, Michigan, Minnesota, Missouri, Mississippi, Montana, North Carolina, North Dakota, Nebraska, New Hampshire, New Jersey, Nevada, New York, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Virginia, Vermont, Washington, Wisconsin, West Virginia, Wyoming
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