This is an international newsgroups and product names are not always used
universally. Preen in my country is a laundry spray. That works very well.
IF you do not mean a laundry spray, perhaps you could tell us the name of
the active ingredient and the mix rate. This information is on the side of
all labels for garden herbicides/pesticides etc.
He did say it was a pre-emergent herbicide. Googling it I see the
active ingredient is trifluralin.
I don't use the stuff as I thought my flowers didn't really fill in
when I did. I'm curious to see what experience others have had.
Perhaps it was some other problem and Preen wasn't at fault.
Green hype. limited effectiveness , plus it eventually breaks down
into fertilizing the weeds it didn't kill. Your results may vary
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.