Pond Weed Identification Guide
Are weeds or algae affecting the clarity and beauty of your pond? Use our pond weed identification guide below to learn about pond weed types and how to control them.
- Find the image that matches your weed or algae species below.
- Click the image link for more detail on control options.
- Not able to match to an image or would like more confidence? Use this guide to send us a sample for identification: How to Send Us a Weed ID Photo.
Once you’ve identified the pond weeds causing trouble in your pond, shop our large selection of algae control and aquatic weed control solutions.
Algae & Chara
Algae is a common nuisance with no defined root system. It often floats on the pond’s surface in mats, although it may emerge at the pond’s bottom before floating to the surface. Chara looks like submerged weed but can be differentiated by its musky smell.
Emergent weeds are rooted plants that grow along the shoreline and stand above the surface or in shallow areas. A defining characteristic of emergent weeds is the stem, which is most often stiff or firm.
Generally found in shallow water, the stem & root system of a floating weed may start at the pond's bottom, although not always. Foliage will be seen floating on the water's surface. If left untreated, they can completely cover cutting off light and oxygen to the fish below.
The "iceberg" of weeds is mostly submerged underwater. One discerning characteristic is their soft stem, which is why they usually do not rise above the water's surface.