Thank you for your question and concern. Velvet grass which

was introduced as a source of forage source and as your know

can become a problem where not wanted. Control and

elimination is possible but near aquatic areas removal

becomes more challenging.

  You did not mention how close to the water area you will be

treating so I'll try to give a general assessment of what is

available. While the following herbicides ingredients and

formulations will give you results their use at or near bodies of

water requires extreme caution as herbicides act much

differently when released in aquatic situations. Products

containing Glysophate, Fluridone, Triclopyr, Imazapyr, or 2,4-D

will work in elimination of your grasses, their use near water

areas require caution to prevent drift or run-off! Agriculture

Vinegar products are also effective. If you should go with using

a herbicide weather synthetic or organic ”Always Read and

Follow the Label Directions.” Also be sure it is Labeled safe for

aquatic use as I do not know how close your application will

be.   

   You may want to consider mechanical means such as

mowing, trimming, or burning of the area. Keep in mind that

Velvet Grass spreads by seeds so removal procedures are most

efficient prior to flowering! Also keep in mind that this is

usually not a one time procedure and may need repetitive

applications.

   I realize I may not have answered you problem completely

but as I said above plant removal in or near water areas is

more complicated. I have listed a few links that may better

help you but I might suggest yu contact your county Extension

Service and/or Conservation District. I have listed their contact

information below as well.

   If we can be of further help do not hesitate to contact us.

   Thank you again for allowing us to help you with your

gardening questions. Here are  some other helpful websites

that may be of interest to you:

BYGL Newsletter: http://bygl.osu.edu/

OSUE Fact Sheets: http://ohioline.osu.edu

State Master Gardener Volunteer website - http://mastergardener.osu.edu

Ask-An-Expert website - https://extension.osu.edu/ask-an-expert

Ask-A-Master Gardener website -
https://extension.osu.edu/https%3A/extension.osu.edu/ask-an-expert/ask-master-gardener-volunteer

Cuyahoga County OSU Extension Office

12200 Fairhill Road, E. Building
Cleveland, OH 44120

Phone:<personal data hidden>
Fax:<personal data hidden>

<personal data hidden>

Cuyahoga County water and conservation Office

3311 Perkins Avenue
Suite #100
Cleveland, Ohio 44114
Phone:<personal data hidden>

cuyahogaswcd,org

https://www.gardeningknowhow.com/plant-problems/weeds/common-velvetgrass-control.htm


https://extension.psu.edu/one-herbicide-mix-to-do-it-all-almost


https://mybackyardlife.com/what-can-i-use-to-kill-weeds-around-my-pond/

   Your welcome. Another product you may look into are products containing Flumioxazine.

I would suggest you contact you extension Ag Agent or Agronomist before using any

herbicides for your purpose. Best of luck.