re: Grass Identification - Paging Craw

I’m not trying to ruffle feathers, but if this describes what’s in your lawn, then by all means, waste your time, money and effort in treating it. Otherwise, pick a sample (preferably with roots, stolons/rhizomes, a seed head if one is available), put it in a ziploc with a wet paper towel and take it to your local extension agent. Identifying a weed from a few grainy pictures is not a responsible thing to do.

What is Southern Watergrass? (Luziola fluitans)
Physical Characteristics
Mostly submerged

Leaves:
Floating near surface or usually emerging less than an inch above the water
0.78-2.5 inches long
0.08-0.2 inches wide

Flowers:
Loose branching
Grow in clusters
0.2-0.78 inches long
Few-flowered
Spikelets have one flower each

Stem:
Hollow Stem
1-3.25 feet long
About 0.02 inches thick
Somewhat branching

Roots:
Rooted at most nodes
Bottom-rooted

Where Does it Grow?
Southern watergrass can be found in ponds, lakes, and slow-flowing streams.