WEED & ALGAE ID GUIDE
Filamentous algae is most common, growing in mats and strings. Planktonic algae causes green water, it has millions of cells that cloud together. Chara is weed-like, it grows like a carpet along the bottom.
Cattails and Other Emergent Plants
Emergent plants grow around the perimeter of a pond in shallow water with all or most of their foliage above water. Examples are Cattails, Bulrush, Reeds, Purple Loose Strife, Pennywart, and Pickeralwood.
The pondweed family has over a dozen varieties with these four being the most common: Sago, Clasping Leaf, Curly Leaf, Large Leaf.
This plant grows in thick clumps and is usually not a big problem, the leaves are in whorls of three around the stem.
Duckweed and Watermeal
Duckweed is hard to control, it forms in a thin layer over the surface in calm ponds. It will grow well in moving water so use of a surface aerator will help in controlling growth.
Waterlilies can become a problem in may ponds, they grow off a large central root system (much like poplar trees). Some growth is great for shade and cover for fish, but when left unchecked they will over populate quickly.
Spreads very easy since fragments of plant can re-root and grow. Do not try to remove by raking.
Other Less Common Weeds
Include Naiad, Coontail, Bladderwort, Hydrilla, Parrot Feather, and Water Hyacinth.