Does Preen keep weeds out of gardens?

Yes, Preen keeps weeds from sprouting in gardens even though the weed control in question does not keep established weeds out of gardens. The herbicide in question has to be sprinkled and watered in during the growing season (and every 9 - 12 weeks thereafter) into the top 1 - 2 inches (2.54 - 5.08 centimeters) of soil -- which then must not be disturbed further - around established woody plants, herbaceous plants 2 - 3 inches (5.08 - 7.62 centimeters) tall, and grasses. Flowering plants must have germinated even though vegetables can be seeded.