Water Hemlock

Asked September 29, 2018, 9:15 PM EDT

HELP! Our naural pond is being overtaken by water hemlock. How do we get rid of it?? Our pond is home to large mouth bass, frogs, salamanders, newts, occasional visits by blue herons, kingfishers, cedar waxwings, and of course ducks (wood and mallards) all fall and winter, so we don't want to do anything that wil harm the wildlife. Thank you!!

Clackamas County Oregon

1 Response

There are a couple of options for chemical control. I would consider spot applications of imazapyr (Habitat) or glyphosate (Rodeo). Both of these specific products are labeled for use around riparian areas and will not harm wildlife or fish. You can look up the labels online and see if these products are something you want to use as well as find specific application directions for spot applications. Applications during the spring or summer when the water hemlock is actively growing prior to flowering will be most effective.
Here is a link to a publication on western water hemlock that you may also find useful:http://www.unce.unr.edu/publications/files/nr/2004/fs0409.pdf