Submerged Weed ID

There are hundreds of submerged and floating weeds that can grow in ponds and lakes.  We have listed some of the most common weeds.  Submerged weeds are best controlled with herbicides containing diquat.  
 
Submerged weeds are weeds that are rooted on the bottom of the pond and most of the plant if not the entire plant stays under water like coon tail, bladderwort, and curly leaf pond weed.. 
 
Floating weeds are plants that float on the surface of the pond or lake.  The water will regularly wash over the top of the plant if the surface is disturbed at all like duckweed. 
 
Use the following images to help identify your weeds.
 

Large Leaf Pond Weed- Leaves both floating and submersed. Submersed leaves are large, oblong, wavy, and taper to the stem. Floating leaves are oval-shaped. Parallel leaf veins are evident. Stems are seldom branched. Leaves alternately arranged on stem. Solid, tightly packed spike of utlets at tip of weed rises above water surface

Tsunami DQ
Curly Leaf Pond Weed- Leaves thin with wavy and finely serrated edges. Stems branched. Upper leaves are often crispy and appear waxy. Leaves alternately on stem. Flowers born on spikes rise above the water surface.

Tsunami DQ
Coon Tail- Leaves whorled around the stem and have a serrated appearance. Spacing between leaf whorls is variable. Consequently, weeds may be long and sparse or bushy. Near the end of the stem leaves and whorls are crowded. Branches are forked repeatedly. Do not confuse with Chara

Tsunami DQ
Duckweed- Leaves the size of a pencil eraser. May be observed individually or in clusters upon close observation. Small root hairs may be seen hanging down from the underside of the leaf. No stem is distinguishable. Heavy growth will blanket the surface with many inches of growth. Duckweed is not interconnected as is Filamentous Algae. Do not confuse with Algae.

Tsunami DQ
Bladderwort- Finely divided leaves scattered along the stem with numerous bladder like structures on leaves. Stems have many branches and are densely leafy at the tips. Flowers are yellow and rise above surface.

Tsunami DQ
Water Milfoil- Leaves whorled in groups of four. Each leaf is divided into many thread-like leaflets extending from a central rib. Forms tangled mats at the surface. Seed heads develop in mid to late season and may extend above the water surface. Treat when weeds are actively growing before flowering occurs

Tsunami DQ
Naiad- Plants of N. guadalupensis are rooted, submersed, and from 0.1 to 1.0 m long. The leaves are usually opposite or subopposite, from 0.2 to 2.0 mm wide, and 0.3 to 3.3 cm long. The teeth along the leaf margin are small, 18 to 100 per side, and barely visible to the naked eye. Sheaths at the base of the leaf are rounded to slightly auriculate. The flowers are small, inconspicuous and borne in the leaf axils on the same plant.
If you can not find the growth here check our other ID sections or Contact Sanco