Pond Logic® Ultra PondWeed Defense® Aquatic Herbicide
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$49.99 - $149.99


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2+ 134.99 Each - Gallons

  • Details
  • Usage
  • Weeds Treated
  • Broad Spectrum Pondweed Control
  • Fast Acting Liquid Formula
  • Short Term Control Of Duckweed

Pond Logic® Ultra Pondweed Defense® works on pond weeds including submerged, floating and emergent weeds. It may be used for short term control of Duckweed in slow moving water. Use all season-long on actively growing plants for best results. Early season emergent treatments may require additional applications.

Usage Information

From dosage rates to product labels, the USAGE tab contains all of the information you need to properly apply your pond care products.

Pond Logic Ultra Pondweed Defense 32 Ounce
32 Ounce
Pond Logic Ultra Pondweed Defense 1 Gallon
1 Gallon
Application Liquid Liquid
Temperature Restriction None None
Square Footage Per Container Up to 5,000 Square Feet Up to 20,000 Square Feet
Shelf Life 2 Years 2 Years

Dosage Rates

Treatment Area
Ultra Pondweed Defense®
Treatment Booster™ PLUS
2,500 Square Feet 16 Ounces (1/2 Quart) 1.5 Gallons 4 Ounces
5,000 Square Feet 32 Ounces (1 Quart) 3 Gallons 6.5 Ounces
7,500 Square Feet 48 Ounces (1-1/2 Quarts) 4.5 Gallons 10 Ounces
10,000 Square Feet 64 Ounces (2 Quarts) 6 Gallons 13 Ounces

Please note: Above are recommendations. Always read the product label.

How To Apply

Mix the amount of Ultra Pondweed Defense® and Treatment Booster™ PLUS (if using) with pond water in a tank sprayer according to label instructions. Use a pressurized pond sprayer to spray the Ultra Pondweed Defense® mixture directly onto to the target weeds. Treat only up to half of the pond's surface and wait 10-14 days before a second treatment. In hot weather or when fish are stressed, treat only 1/4 - 1/3 of the pond's surface at a time. For deeper water, place the sprayer's tip beneath the water's surface. Over time, the weeds will begin to brown and die. Once completely dead, use a rake, like the Pond & Beach Rake, to remove dead weeds to prevent an accumulation of dead plant material and muck.

When To Apply

Ultra Pondweed Defense® has no temperature restriction, but it should only be applied when weeds are actively growing. Use with Treatment Booster™ PLUS for best results.


  • Wait 3 days before using treated water for human drinking water.
  • Wait 1 day before using treated water for livestock and domestic animal consumption.
  • Wait 5 days before using treated water for irrigation.


Weeds Treated

The first step towards effectively treating any pond weed is proper identification. Pond Logic® Ultra PondWeed Defense® Aquatic Herbicide is recommended for use against each of the weeds listed below. Click on your desired weed for more information and alternate control options.

  • American Pondweed
  • Bladderwort
  • Clasping Leaf Pondweed
  • Coontail
  • Curly Leaf Pondweed
  • Duckweed
  • Eurasian Watermilfoil
  • Hydrilla/Elodea
  • Lily Pads
  • Sago Pondweed
  • Southern Naiad
  • Watermeal
  • Water Shield

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