Does Preen work to stop Morning glory seeds from coming up all over the place? I am in zone 5 and need to do this soon. Does anyone know if it helps?

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Thanks...that is great advice about using the crank spreader and getting it on early enough! I am in southern MI. and I had better do it this weekend! I hate weeds! I will look for the cheaper brand for sure!
How does Preen determine what is a flower and what is a weed? I am afraid to use it in my gardens.
So as long as the plant is already grown and not a seed, it will be okay?

Very glad to come across this forum.  I've got several large bags of preen that I picked up new at a garage sale for next to nothing but have been afraid to use it as I did not know how and the words on the bag don't answer the obvious questions.  So effective for up to 90 days and okay to get on existing plants, right?  Does that include veggies?   Thanks!


Preen weed killer is a pre-emergent herbicide that is safe to use around flowers, vegetables, trees and other desirable plants. Once activated by water, this granular weed killer creates a 1- to 2 inch-weed-killing barrier beneath the surface of the soil that prevents weeds from germinating. Preen can be used during any time of the year but, like most pre-emergent herbicides, should not be used over flower seeds as it will stop them from germinating.
Read more: How to Use Preen Weed Killer | Garden Guides

I used it last year on a new berm, and it worked great.

Just saw this...thanks, Bonnie.


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