The Grass Doctor

Preen Fertilizer Knowledge Base

what is this whitish yellowish foam in my flower bed? There are clumps of a whit/yellow foam in my flowerbed and I was wondering whether it is something from fertilizer, preen, or from some plant.
I used Preen weed preventer for flower and vegetable garden a week ago? Will my vegetables be safe to eat ? I'm going to put a fertilizer too pretty soon for nutrients...
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