Bladderwort is a submersed free-floating plant. There are approximately 200 species in the world, ranging in size from a few inches to several feet long. Tiny bladders attached to the leaves trap and digest very tiny animals.

All bladderwort species are rootless. They have main stems from which lacy, often complex leaves grow. Bladderwort flowers are usually bright yellow (sometimes lavender, depending on species); the flowers have two 'lip-like' petals of about equal size. Flowers are on long stalks that emerge several inches above the water. The carnivorous bladders are attached at regular intervals along the linear leaf segments.

Mechanical Control

Bladderwort can be removed by cutting and raking from the pond. It will regrow from remaining roots.

Chemical Control

There are several options to control Bladderwort.

  1. Use a season long herbicide such as Sonar A.S.. One treatment treats Bladderwort and many other common pond weeds for the season.
  2. Use a broad spectrum contact herbicide, such as Ultra PondWeed Defense®, will quickly kill Bladderwort. Because it does not stay in the water body, multiple treatments may be needed throughout the season.

Chemical Application Best Practices

Anytime you use chemicals treat weeds and algae, please keep in mind the following:

  • Treat your pond in sections. Treat only half the pond's surface at a time. During hot weather or when treating heavy growth, it is important to treat no more than ¼ of your pond at a time and wait the full 14 days before re-applying. This helps lower the risk of fish loss during hot weather or when treating heavy growth.
  • Once the weeds have browned & died, use a weed cutter & rake to remove as much dead material as possible. This prevents an accumulation of dead plant material and muck.
  • Take a proactive approach to pond management. Use PondClear, MuckAway and Pond Dye to keep your pond looking great. For more information, see our article on the Airmax® Ecosystem

Ask an Expert

If you are unable to identify your pond weed(s) using our Weed ID Guide, follow this article to email us a photo.

  • List | Grid


  • Navigate® Granular Aquatic Herbicide

    Navigate® Granular Aquatic Herbicide

    Easy-To-Use Granular Formula Great For Floating & Submerged Control Weeds Surrounding Docks & Shorelines This simple to use, Navigate ® granular aquatic herbicide is perfect for spot treating weeds around docks, beach areas and...
    Read More »
  • Pond Logic® Ultra PondWeed Defense® Aquatic Herbicide

    Pond Logic® Ultra PondWeed Defense® Aquatic Herbicide

    Review star icon Review star icon Review star icon Review star icon Review star icon
    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. This pond herbicide may be used for short...
    Read More »
  • SePRO Sonar™ A.S. Aquatic Herbicide

    SePRO Sonar A.S. Aquatic Herbicide

    Review star icon Review star icon Review star icon Review star icon Review star icon
    Season Long Weed Control Treats Floating & Submerged Weeds Systemic Herbicide That Kills Roots Even the most persistent weeds don't stand a chance against Sonar™. SePRO Sonar™ A.S. Aquatic Herbicide can be used to control stubborn...
    Read More »
  • SePRO Total Pond - Prevent®

    SePRO Total Pond - Prevent®

    Prevent & Control Weeds All Season Systemic Herbicide That Kills Roots Easy-To-Apply Granular Formulation SePro Total Pond - Prevent ® controls a wide variety of submerged and floating aquatic vegetation with a single treatment. Prevent...
    Read More »