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Why can’t I use lawn weed killers to clean up my pond’s shoreline? | Ponds & Lakes Q&A


Q: Why can’t I use lawn weed killers to clean up my pond’s shoreline?

Q: Why can’t I use lawn weed killers to clean up my pond’s shoreline?

Kevin – Heath, OH

A: If you read the fine print on your favorite lawn weed killer and your favorite aquatic shoreline weed killer, you’ll notice that they both contain the same active ingredient—glyphosate. This broad-spectrum herbicide works wonders in destroying actively growing foliage. In fact, it’s one of the most popular weed destroyers out there.

Inert Ingredients

Just because the lawn weed killer and shoreline weed killer have the same active ingredient, however, doesn’t mean you can use them interchangeably. You see, the inert or inactive ingredients used in the formulas are different. Those different ingredients make the shoreline chemicals safe around bodies of water and lawn chemicals unsafe around bodies of water.

By law, these differences and designated uses must be noted on the herbicide’s label. The Environmental Protection Agency approves the label and warns consumers of any dangers. In fact, if you continue to read that fine print on your lawn weed killer’s label, you’ll find it says to not apply the product on or around water sources.

Stay Legal

If you’re treating weeds around your pond or lake, be sure to use one that has been approved for use around water bodies, like Shoreline Defense® and Treatment Booster™ PLUS. When applied directly to the foliage, the aquatic herbicide safely destroys a range of weeds and grasses—including cattails—on the shoreline, beach or anywhere emergent weeds grow.

Like it or not, you should read your labels and use the right formula for the job. You’ll be keeping your water supply safe, the government happy and your land legal.

Pond Talk: How carefully do you read the fine print on your lawn and aquatic herbicide’s labels?

Safely Treat Shoreline Weeds & Grasses - Pond Logic® Shoreline Defense® & Treatment Booster™ PLUS

2 Responses

  1. KEVIN, ADDING SALT BLOCKS IN LARGE NATURAL PONDS WILL KILL WEEDS JUST AS A 25 LB. SALT BLOCK THAT I ADD TO MY LINER POND WILL KILL WEEDS. I LAY A BLANKET OVER THE WEED SO THAT THE LEAVES GET WET. THE LEAVES WILL TURN BROWN AND DIE. THE LEAVES ARE THE MEANS OF DRAWING WATER TO THE ROOTS OF THE PLANT, TOO MUCH STANDING WATER ON ANY PLANT, IS NOT GOOD FOR IT,CAUSING LEAF ROT. ALSO IF THE FISH BITE IT THE WILL NOT DIE. THE SALT IS GOOD FOR CLEANING THE ROCKS & KEEPING BACTERIA OFF OF THE FISH,MAINLY ICK & FIN ROT.

    MY LINER POND HOLDS 3,000 GALLONS OF WATER. THERE ARE
    BETWEEN 68 – 73 KOI. NEVER HAD A PROBLEM AFTER ADDING A SALT BLOCK. THEY HAVE FUN RUBBING AGAINST IT.

    ALWAYS READ OR ASK BEFORE ADDING ANYTHING TO A POND,
    NATURAL OR NOT.

    ADDING WATER BY MEANS OF THE LEAVES TO THE ROOTS,IT IS CALLED OSMOSIS,THE SALT WILL KILL THE ROOTS.

    PLANTS THAT ARE POND PLANTS,THE SALT WILL NOT HURT THEM,– THISTLE & DANDELIONS IT WILL KILL.

    GOOD LUCK ,YOUR PONDERING FRIEND — GREG JOHNSON

    • Hi Greg – I have to urge EXTREME caution on your comments. Adding salt to a larger body of water can be very detrimental. Larger bodies of water (compared to a backyard water garden) have an established ecosystem. Water changes are not a common and cannot be done easily if someone were to add too much of anything. In these larger water bodies, I would recommend using a pond dye as one way to limit the amount of sunlight entering the pond.

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