From the web:
"The active ingredient in Preen Garden Weed Preventer, Weed Preventer Plus Plant Food and Preen Mulch Plus is trifluralin, used to control broadleaf weeds. Although rated as having low toxicity to humans, this herbicide is highly toxic to aquatic wildlife and should not be applied so heavily that runoff occurs.May 26, 2018"
Preen's Grass and Weed Killer, designed for use between pavers and the like, contains the controversial chemical glyphosate.
The main chemical in products such as Preen Garden Weed Preventer is trifluralin, which can irritate eyes and skin. It is harmful to fish and other aquatic life as well, and it should not be used near waterways, ponds, storm sewers or even driveway drains.
On Monday, March 22, 2021 Su Clift <coffeebeansu...> wrote:
Does anyone know if it’s safe to use Preen or Snapshot in areas where birdseed is spread on the ground?