Myriophyllum spicatum

Myriophyllum spicatum, commonly known as Eurasian watermilfoil, is a submerged aquatic plant native to Europe and Asia. However, it has become invasive in many parts of North America. This plant features long, slender stems that can grow up to 10 feet in length and are covered with feathery leaves arranged in whorls around the stem. The leaves are typically 1-2 inches long and have a reddish-brown coloration at the base. Under favorable conditions, Eurasian watermilfoil can grow rapidly, forming dense mats of vegetation. These mats can interfere with recreational activities such as swimming and boating. Additionally, the plant negatively impacts aquatic ecosystems by outcompeting native plants for resources and altering habitat structure. Control measures for Eurasian watermilfoil include physical removal by hand or machine harvesting, chemical treatments using herbicides specifically designed for aquatic use, and biological control using natural predators such as weevils or beetles. Preventive measures include properly cleaning boats before entering new bodies of water to avoid spreading plant fragments. Overall, Myriophyllum spicatum is a highly adaptable invasive species that poses significant challenges for management in many freshwater ecosystems across North America.

Characteristics

Plant Type

Herb

Life Cycle

Perennial

Genus

Myriophyllum

Family

Haloragaceae

Hardiness Zone

5-9

Mature Height

0.3 m to 2.74 m

Mature Spread

1.52 m

Leaf Color

Green

Leaf Type

Deciduous

Flower Color

Red

Flower Size

0.51 cm to 0.51 cm

Bloom Time

Summer, Early fall, Mid fall

Planting Time

Spring, Summer, Autumn

Harvest Time

Late summer, Fall, Early winter

Native Area

Turkey, Sweden, India, Slovakia, Montenegro, Pakistan, Slovenia, Morocco, Croatia, Belarus, Tanzania, Germany, Indonesia, Cameroon, Koppen, Romania, Latvia, Belgium, Portugal, Netherlands, Saudi Arabia, Malawi, Tunisia, Philippines, Bulgaria, Turkmenistan, Ukraine, Chad, Lebanon, China, Afghanistan, Syria, Kyrgyzstan, Kazakhstan, Italy, Japan, Mongolia, Finland, Iran, Egypt, Angola, Austria, Namibia, Eritrea, Zimbabwe, Uzbekistan, Russia, Iraq, Iceland, Estonia, South Korea, Botswana, France, Nepal, Tajikistan, Czech Republic, South Africa, Zambia, Sudan, Armenia, Poland, Greece, Serbia, Lithuania, Norway, Spain, Switzerland, Vietnam, Denmark, Bhutan, Albania, Ireland, United Kingdom, Hungary, Algeria, Thailand

Tags (6)

Common Names (10)