Pre Emergent Fertilizer

Pre-emergent fertilizer is a type of lawn and garden product designed to prevent the germination of weed seeds. It acts as both a fertilizer, providing essential nutrients for your plants, and as an herbicide, preventing weeds before they appear. Here’s what you should know about it:

How It Works

• Timing: Pre-emergent fertilizers must be applied before the weed seeds germinate, which typically means early in the growing season (early spring or fall, depending on the type of weeds you’re targeting).
• Mechanism: The herbicide component creates a chemical barrier in the soil. When a weed seed tries to germinate, it absorbs the herbicide and is prevented from growing further.

Types of Weeds Controlled

Pre-emergent fertilizers are particularly effective against annual weeds, which grow from seed each year. Common targets include:

• Crabgrass
• Goosegrass
• Foxtail
• Some broadleaf weeds

Application Tips

1. Timing: Apply when soil temperatures are around 50-55°F (10-13°C), which is when many weeds begin to germinate.
2. Even Spread: Ensure even distribution to avoid gaps where weeds can establish.
3. Watering: Water the area lightly after application to activate the herbicide barrier.
4. Reapplication: You might need a second application, especially in areas with long growing seasons or heavy rainfall.

Choosing the Right Product

• Read Labels: Different products target different types of weeds. Ensure the product you choose is suitable for both the weeds you want to prevent and the plants you want to fertilize.
• Active Ingredients: Common active ingredients in pre-emergent herbicides include Prodiamine, Pendimethalin, and Dithiopyr.

Safety Precautions

• Follow Instructions: Carefully read and follow the manufacturer’s instructions for application rates and safety precautions.
• Protect Non-Target Plants: Be cautious of applying near desirable plants as some pre-emergent herbicides can harm them.

Limitations

• No Effect on Existing Weeds: Pre-emergent herbicides will not kill existing weeds, so they need to be combined with other weed control methods if weeds are already present.
• Not Suitable for All Plants: Some garden plants and flowers may be sensitive to the chemicals used in pre-emergent fertilizers.

Environmental Considerations

• Runoff: Be mindful of potential runoff into waterways, which can be harmful to aquatic life.
• Organic Alternatives: For those looking for environmentally friendly options, consider organic pre-emergent herbicides like corn gluten meal.

By understanding and properly using pre-emergent fertilizers, you can enjoy a healthier, weed-free lawn and garden.