But if you don't want unsightly dead weeds in your garden. You still have to remove any existing weeds. And their roots by hand preen is not a weed killer. It's a weed preventer.

Preen Natural Vegetable Garden Weed Preventer offers completely natural weed prevention and is safe for use around children and pets.

Preen ® Garden Weed Preventer helps to prevent germination of seeds from the list of weeds shown on the label for up to 12 weeks per application. It does not kill or inhibit existing weeds in any way.

Preen, whose active ingredient is trifluralin , is generally safe for birds and mammals at levels at which it is used, but can be highly damaging to aquatic life. For this reason, it has been banned in the EU .

Apply preen when the garden is dry if you apply when wet the granules can stick to the leaves.

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

Preen Natural Vegetable Garden Weed Preventer is made with 100 percent corn gluten, a natural herbicide that works as a pre-emergent - it keeps weed seeds from sprouting. And, Preen Natural Vegetable Garden Weed Preventer is safe to use around children and pets.

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

Answer. The active ingredient in Preen is trifluralin, a pre- emergent herbicide.

While Preen is generally safe and effective for most types of gardens, there are a few situations where you should avoid using it. You should not use Preen on newly seeded areas or on areas where you plan to sow seeds in the near future.

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

Harmful if swallowed or inhaled. Avoid prolonged contact with skin, eyes or clothing. with soap and water after handling.