To our knowledge, these weeds are not currently present in our lakes and we must keep it that way!!!

If you believe that you may have found one of these weeds in the lake, take a sample, place it in a plastic bag, freeze it, and contact someone from the Groton Lakes Association as soon as possible.

Read more about Invasive Non-Native Plants

Common Name:
 Eurasian Milfoil

Species Name:
 Myriophylium Spicatum

Eurasian Milfoil has 12 to 21 leaflet pairs, whereas other species such as Northern Milfoil have only 5 to 10 leaflet pairs. Eurasian Milfoil is limp and soft, not stiff and bristly. Eurasian Milfoil plagues MANY lakes and ponds in North America. We MUST keep it out of Lost Lake and Knop’s Pond!!
Learn more about Eurasian Milfoil

Common Name:

Species Name:
 Cabamba Caroliniana

Cambamba is a non-native, very aggressive plant. The GLA treated an infestation at the public boat launch in 1996. It is easy to identify because of the distance from the main stem before the cluster of leaves start to fan out.
Learn more about Fanwort

Common Name:
 Variable-Leaf Milfoil

Species Name: 
Myriophyllum Heterophyllum

Variable-Leaf Milfoil is a BIG problem on our lakes and the primary target of our weed treatment efforts. It is a submersed, perennial usually found rooted in up to 6 feet of water. Dense growths of Variable-Leaf Milfoil provide breeding areas for mosquitoes and degrade water quality and habitat for fish and wildlife. Although the plant is largely submersed, an emergent portion may extend 4 to 6 inches above the surface. Reproduction occurs both vegetatively and by seed production. This is a very common Aquarium plant. NEVER (let’s repeat… NEVER) empty a fish tank where it can drain into the lake!! This will introduce undesirable exotic weeds into the ecosystem of our lakes.
Learn more about Variable-Leaf Milfoil:
Global Invasive Species Database
Invasive Plant Atlas of New England