Preen is a herbicide that is used to prevent weed seed germination. It will also prevent germination of desired seeds. As the label for Preen advises, the effects last up to three months, so desirable seeds may be planted after that time period.
About the Author
Hepzibah Flurge has been writing professionally since 2008. She is a horticulturist and her work appears on various websites and assorted gardening blogs. She holds a Bachelor of Science in horticulture.