Simazine

One of the more effective herbicide active ingredients on the market is Simazine. This product is known for successfully controlling woody plants as well as annual and perennial grasses. Simazine is great for people who want to cut down on hand-pulling weeds that are growing in their gardens and landscapes.

Learn some background information about simazine, its mode of action and benefits. You can also access this page to shop for our recommended product that contains Simazine.

What is Simazine?

Simazine is a pre-emergent herbicide used to selectively control a wide variety of annual and perennial grasses and broadleaf weeds. It has found much success in croplands to keep target weeds off of fruits and vegetables in orchards, vineyards and other areas where crops are grown.

Simazine has also been used for controlling weeds on turfgrass and as a non-selective form of weed control when used at higher rates on industrial sites. Simazine has also been used to control aquatic weeds like algae and submerged weeds.

How Does Simazine Work?

Mode of Action

Simazine control weeds through its mode of action by inhibiting photosynthesis in plants. While used primarily as a pre-emergent to prevent weeds from growing, seedlings that do emerge turn yellow and die shortly thereafter.

Benefits of Simazine

Simazine is a flexible herbicide as it can be used to control weeds on agricultural sites, turfgrass, non-selective weed control on industrial sites and aquatic weed control. Simazine also has an impressive residual effect of 3 to 6 months.

Drawbacks of Simazine

Simazine is not able to control nutsedges. Since it is a pre-emergent, it is not able to control established weeds that have already germinated.

Is Simazine Safe?

Simazine is safe to use when applied according to label directions. It is recommended that when handling Simazine (or any of the other chemicals we carry) to use proper personal protective equipment (PPE) before handling or applying (Gloves, protective eyewear, long-sleeved clothing). Please refer to the label for proper safety instructions.

What To Expect

It is recommended to apply Simazine alongside a pre-emergent herbicide that targets grassy weeds. Apply Simazine in the late winter to control weed seeds that intend to germinate the following spring and then reapply in the late summer to control weed seeds that will germinate in the fall. After the application, you should water the area to activate the product.

Featured Products

Princep Liquid - Princep Liquid is a pre-emergent herbicide that contains the active ingredient Simazine and can control unwanted weeds in areas such as residential and commercial lawns, forests, nurseries, greenhouses and even harvestable crops.