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Spiked Water-milfoil

Myriophyllum spicatum

Also called Eurasian watermilfoil, Eurasian Water Milfoil, Eurasian Spiked Water Milfoil, Spike Water Milfoil, Spiked Water Millfoil, Spike Watermilfoil, Spiked Watermilfoil

Spiked Water-milfoil
Photo: Unknown author, CC BY-SA 3.0

Spiked water-milfoil is a submerged perennial aquatic plant that grows in still or slow-moving water, with feathery whorled leaves and a spike of tiny flowers above the surface. It is highly invasive in many regions, so it is rarely grown on purpose and should not be released into the wild.

Family
Haloragaceae (Halorag family)
Grows as
Aquatic, Perennial
Light
Full sun, Part shade
Water
Grows submerged in water; keep it fully covered in still or slow-moving water.
Soil
Rooted in mud or sediment at the bottom of ponds, lakes or slow streams.
Temperature
Cool to warm temperate water; tolerates a wide range, from near freezing to warm summer water.
How easy
Easy
Safety
Not known to be toxic
Native range
Temp. Old World to Trop. Mts., Aleutian Is.
Climate
temperate

About

Myriophyllum spicatum (Eurasian watermilfoil or spiked water-milfoil) is a submerged perennial aquatic plant which grows in still or slow-moving water. Eurasian watermilfoil is native to Europe, Asia, and North Africa, but has a wide geographic and climatic distribution among some 57 countries, extending from northern Canada to South Africa. It is considered to be a highly invasive species.

Safety

Myriophyllum spicatum produces ellagic, gallic and pyrogallic acids and (+)-catechin, allelopathic polyphenols inhibiting the growth of blue-green alga Microcystis aeruginosa.

Where it grows

Myriophyllum spicatum is found in disperse regions of North America, Europe, Asia, Australia, and Africa.

Other Myriophyllum plants

Alternateflower watermilfoil · Parrot feather watermilfoil · Upright Water Milfoil · Western watermilfoil · Myriophyllum implicatum · Myriophyllum indicum · Cutleaf watermilfoil · Red Stemmed Parrot's Feather · Shortspike watermilfoil · Amphibious Water Milfoil · Myriophyllum variifolium · Whorl-leaf watermilfoil

Text excerpted from the Wikipedia article Myriophyllum spicatum by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.

The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.

Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.

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