According to the OSU Extension, many vegetable seeds can be planted in soil treated with Preen. Large seeds, like beans and peas, are placed deeper in the soil. Smaller seeds, like carrots, are closer to the top of the soil and may have more trouble if Preen has been recently applied. The Preen label has a table listing when to applly Preen in vegetable gardens.
About this Author
Aileen Clarkson has been an award-winning editor and reporter for more than 20 years, earning three awards from the Society of Professional Journalists. She has worked for several newspapers, including "The Washington Post" and "The Charlotte Observer." Clarkson earned a Bachelor of Arts in journalism from the University of Florida.