Waterscapes 101

Aquatic Weed Management

Broad spectrum herbicide:

Non-selective herbicide, will kill mostly any vegetation it comes in contact with.

Systemic herbicide:

Chemical that is absorbed by the plant down to the root system killing it entirely.

Contact herbicide:

Herbicide that only kills the plant it comes in contact with


Used with herbicide to improve effectiveness. Acts as a sticker.

Types of aquatic weeds

Emergent weeds:

Plant roots are in water or moist soil but the majority of the plant is above water. Examples include cattails, creeping water primrose, iris, phragmites

Submerged weeds:

Plants that remain underwater. They may be rooted or unrooted. Examples include watermilfoil, hydrilla, elodea, naiad, bladderwort

Floating weeds:

Plants that have leaves that float at the surface. These can be rooted or unrooted. Examples include water lilies, pondweed, spatterdock, water hyacinth

The active ingredients in aquatic herbicides react differently to plant categories and even specific species of plants. There is often more than 1 weed type to be managed. The herbicide effectiveness chart identifies which herbicides can be effective for multiple species.