Mulch can be a major weed prevention tool, but mulch alone can't do it all. Preen and mulch together are a one-two punch of weed prevention and can be a safe, yet effective, combination in weed prevention.

When applied monthly, Preen Vegetable Garden Weed Preventer keeps broadleaf and grassy weeds from growing naturally. That reduces weeding duties and saves you time and work. Preen Vegetable Garden Weed Preventer is safe for use around established vegetables, herbs, fruits, annuals, perennials and other plants.

6 months Up to 6 months per application, excluding New York. In New York only, up to 4 months per application. The rate at which Preen® Mulch with Extended Control Weed Preventer biodegrades will depend on temperature, soil type, rain/moisture, sunlight and amount applied.

A: Thank you for your inquiry! Preen Garden Weed Preventer has an indefinite shelf life as long as it is kept sheltered from moisture and sunlight.

flower seeds Preen should not be used on flower seeds. It can be used after flowering plants have germinated and are 2-3 inches tall. Preen may also be incorporated into the soil when seeding vegetables or applied after mulching beds. By applying Preen as early as possible, you can eliminate the need for hand‑weeding.

Preen is mostly used during gardening; however, it can affect the environment when used excessively or wrongly. The main environmental impact of Preen is the contamination of marine life. A lake or a river will not benefit from weed management herbicides like Preen, intended to destroy plants or eradicate weeds.

flower seeds Preen should not be used on flower seeds. It can be used after flowering plants have germinated and are 2-3 inches tall. Preen may also be incorporated into the soil when seeding vegetables or applied after mulching beds. By applying Preen as early as possible, you can eliminate the need for hand‑weeding.

That's a good question. A lot of people think rain will wash away our products and make them ineffective, but this is simply not true. Actually, rain makes our lawn treatments work much better. In order for a pre-emergent to effectively keep weeds from growing in your lawn, it must be incorporated into the soil.

The active ingredient in Preen is trifluralin. It is a suspected carcinogen, and is toxic to fish and aquatic life, and earthworms.

Preen lasts for about 8-12 weeks, so you will need to reapply it at least once per season. Round Up can last for up to several weeks, but you may need to reapply it more frequently if you have a lot of weeds. The Preen and Round Up Method is a simple and effective way to control weeds in your garden.

That's a good question. A lot of people think rain will wash away our products and make them ineffective, but this is simply not true. Actually, rain makes our lawn treatments work much better. In order for a pre-emergent to effectively keep weeds from growing in your lawn, it must be incorporated into the soil.

Preen Mulch has an added weed preventer in it so it blocks weeds from germinating for six months. Each bag covers up to 12 square feet since it only needs to be applied to a depth of 2-inches to suppress weed growth, instead of the usual 3-inch depth recommended for other mulches.