Curly Pondweed (Crispus) is generally described as
a perennial forb/herb.
not native to the U.S. (United States)
and has its most active growth period in the
spring and summer and fall .
The greatest bloom is usually observed in the
with fruit and seed production starting in the
spring and continuing until
not retained year to year.
Curly Pondweed (Crispus) has a
short life span relative to most other plant species and a
rapid growth rate.
Curly Pondweed (Crispus) is not commonly available from nurseries, garden stores and other plant dealers and distributors. It can be propagated by
bare root, seed, sprigs.
It has a
moderate ability to spread through seed production and the seedlings have
Note that cold stratification is
not required for seed germination and the plant cannot survive exposure to temperatures below
none tolerance to drought and restricted water conditions.
Uses of : Landscaping, Medicinal, Culinary, etc.
Wildlife: Curly pondweed tends to increase oxygen levels and produce substantial organic material in aquatic environments (Guard 1995). This pondweed shelters small fish and aquatic insects that provide food for larger fish and amphibians (Ibid.).
General: Pondweed family (Potamogetonaceae). Curly pondweed is an introduced, fast growing perennial. The stems are flattened and somewhat branching, forty to eighty centimeters long and mostly one to two millimeters wide (Guard 1995). The leaves are simple, long, narrow and attached directly to the stem. The flowers are brownish and inconspicuous and usually occur from May to October.
Required Growing Conditions
Curly pondweed has been introduced from Massachusetts to Minnesota, south to Virginia and Missouri (Tiner 1987). For current distribution, please consult the Plant profile page for this species on the PLANTS Web site.
Adaptation This species has invasive qualities. Curly pondweed is commonly found in ponds, lakes, canals, pools and slow moving water of rivers and streams. This plant grows well in sandy, loamy and clay soils. It prefers acid, neutral and basic soil and can grow in very alkaline and saline soils. This species is not shade tolerant.
Cultivation and Care
Propagation by Seed: Curly pondweed seeds should be sown as soon as they are ripe, in summer or early autumn (Heuser 1997). The seeds lose viability quickly if they are allowed to dry out (Ibid). Prick out the seedlings when they are large enough to handle and increase the depth of water around the pot until the plants are covered by a few centimeters of water. Grow the plants in a sunny position in the greenhouse for their first winter, increasing the depth of water, as the plants grow larger. Plant them out into their permanent positions in early summer.
Introduced into the U.S. Considered a pest by several sources.
General Upkeep and Control
Curly pondweed is an aquatic plant that can be used as an oxygenator of ponds. This species sometimes becomes a pest in waterways lakes and reservoirs (Guard 1995). It is a fast growing plant in need of constant checking to make sure it does not overrun ponds, pools or canals.
Source: USDA, NRCS, PLANTS Database, plants.usda.gov.
National Plant Data Center, Baton Rouge, LA 70874-4490 USA