Weed Control Seed

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Apply Weed Control When Seeding?! Yes, You Can! For years, professionals lived by a simple rule when establishing a new lawn or overseeding: never apply weed control as it will limit the ability Learn how to kill weed seeds in soil to prevent weeds and other invasive grasses from continuing to sprout every year. Weed control is the biggest problem facing wildflower establishment for direct-seeded projects. Learn more about weed control methods in wildflower gardens.

Apply Weed Control When Seeding?! Yes, You Can!

For years, professionals lived by a simple rule when establishing a new lawn or overseeding: never apply weed control as it will limit the ability to raise a healthy stand of turf. This meant that weeds had free reign to germinate and compete with the new turf for up to a full month. Then they would need to be controlled once the turf was established.

Now there’s a new product with pre-emergent weed control that you can apply when you seed –whether bare-ground seeding or overseeding.

Lebanon’s ProScape® Starter Fertilizer 21-22-4 with Mesotrione is ideal for use during turf establishment (bare ground seeding, sodding, sprigging or plugging), renovation or overseeding. The mesotrione ingredient is a game changer that offers pre-emergence control of 33 listed broadleaf and grassy weeds. It even controls crabgrass!

The 35% slow release nitrogen from methylene urea insures continuous feeding throughout the early stages of the plant’s life, while the Mesotrione controls weeds for up to 6 weeks. Weeds sprout white and then die quickly without harming the new grass.

This product is a game changer: Healthier new turf with fewer noxious weeds to eradicate later. Invest less effort and get instantly better results.

Get it now from your experts at Central. Contact us for more information.

How to Kill Weed Seeds in Soil [5 Easy Methods]

To kill weed seeds in soil you will have to apply one or more of the following methods:

  • Heat soil to temperatures high enough to kill weeds seeds
  • Force seeds to sprout and destroy growing weeds
  • Apply chemical or natural weed killers that prevent weeds from sprouting
  • Use flame weeding to destroy weeds and seeds at once
  • Layer mulch in garden areas to suppress weed sprouting and attract insects that eat seeds
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With this arsenal of tricks for killing weed seeds before they sprout, you can stop the spread of weeds in both your lawn and garden.

Table of Contents

5 Tips for Killing Weed Seeds

Rather than spending time and effort battling weeds as they sprout, attack weeds at the source by killing weed seeds. Each of these methods destroys weed seeds, which ensures you won’t have to battle recurring weed invasions. Try these ways to get rid of weed seeds yourself.

Solarization

Soil solarization is a very powerful method for killing weed seeds. Weed seeds begin to die if soil temperatures surpass 108 degrees, with full seed death ensured by soil surface temperatures of 140 degrees or more. Solarization uses clear plastic tarps to trap heat at the soil surface, killing weed seeds within the tarped area. To solarize an area, follow these steps:

  • Clear the area of all vegetation through use of a hoe or other garden implement. Remove any woody stumps
  • Till the soil to further break up any weed root systems left behind.
  • Rake away all vegetation residue
  • Water the tilled and cleared soil with a garden hose until it is damp.
  • Lay a sheet of clear plastic over the area. Weigh it down tightly at the edges
  • Leave the plastic in place for at least two months.

Solarization is the best method to reclaim a weedy garden or other area. It is a “clean slate” for your soil, because seeds will be destroyed by the solar heat trapped beneath the plastic.

It is typically tough to implement solarization in large areas and is not usually suitable for use in lawns, where you may want to preserve grass or other plants. Pre-emergent weed killers and flame weeding are much better for use in lawns.

Till and Kill

Weed seeds can lie dormant in soil for decades and are only “activated” when brought to within an inch of the surface. One method to rid soil of dormant weed seeds is to force these dormant seeds to sprout, then attack them with a powerful natural or chemical weed killer. To do this:

  • In spring, till the affected area. Tilling brings dormant seeds to the surface
  • Water the area for 1–2 weeks with a sprinkler or soaker hose
  • When weeds begin to sprout, apply the weed killer of your choice
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This is another “clean slate” method, where you force weed seeds to show themselves and then kill young weeds before they mature and cast seeds. Because of the invasive tilling step, it is not best used in areas with desirable grasses and plants.

Use Pre-Emergent Weed Killer

Pre-emergent weed killer stops weeds in their tracks. It works by attacking weed seeds just as they begin to germinate, killing them before they even poke above the surface. It’s a weed killer so good, the only sign it’s working is that there will be no new weeds at all.

Weed Control

The Importance of Removing Weeds and Weed Seeds in Your Planting Site

Weed control is the biggest problem facing wildflower establishment for direct-seeded projects and one which has no easy solution. Weed seeds are present in many situations and lie dormant, but viable, for long periods. A weedy area converted to wildflowers will have a large reservoir of weed seeds in the soil, ready to germinate when conditions are favorable. In most cases, it is advisable to consider weed control in two phases – as part of site preparation prior to planting, and as an important component of a post-germination maintenance program.

Weed Control Methods

Before planting, existing weeds and unwanted vegetation can be removed in a number of different ways.

  • Smothering
  • Tilling
  • Using the no-till method
  • Applying a non-selective, non-residual herbicide such as a glyphosate product
  • A combination of tilling and an herbicide.
  • For additional weed control after site preparation, a soil fumigant that kills weed seeds may be used

SMOTHERING

Smothering of existing weeds and vegetation is an option for small-scale planting projects and can be done with black plastic that is UV stabilized. This method “cooks” the vegetation and weed seeds in the topsoil. The edges of the plastic should be covered with dirt to prevent airflow underneath the plastic. This is a good option if you wish to avoid the use of herbicides. However, smothering usually takes a full growing season to successfully kill perennials that can regrow from the roots.

TILLING

Repeated tilling is another good option if you wish to avoid the use of herbicides. The initial tilling removes the existing vegetation, and then repeated tilling every three weeks for a full growing season will help to deplete the weed seeds in the soil by killing newly sprouting weeds. In dry areas, providing supplemental water will encourage weed germination and regrowth so that repeated tilling can be effective.

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NO-TILL METHOD

An effective, no-till method to prepare a seed bed is to apply a glyphosate herbicide and allow the vegetation to die back (usually about 10-14 days). Use a scalper to remove the dead thatch and scratch up the soil surface. The top surface of the soil is lightly roughened by the scalper and makes a good seed bed. Once seeds are sown, go over the area with a roller or cultipacker to cover the seeds.

Methods for Extremely Weedy Areas

  1. Till soil or spray vegetation with glyphosate herbicide. When using an herbicide, allow vegetation to die, then rake out the dead debris. If aggressive, perennial weeds such as bindweed are present, using an herbicide is more effective than tilling.
  2. Irrigate to encourage germination of weed seeds near the surface; most seeds will germinate within two weeks if consistent moisture is available. Do not till the soil again because this will bring even more weed seeds up to the surface.
  3. Spray any new growth with glyphosate herbicide.
  4. After raking out dead vegetation, allow soil to recover for 3-4 weeks before planting seed.

Once the seeds have germinated, further weed control is usually necessary. If practical, pull all weeds as soon as they can be identified. Other successful techniques are spot-spraying with a general herbicide or selectively cutting weeds with a string trimmer. Be sure to remove weeds before they reseed.

Many unwanted annual and some perennial grasses can be controlled with the herbicides Grass-B-Gon®*, Ornamec®* and Fusilade®*. These post-emergents do not affect broad-leaved plants so they can be applied over existing flowers; they are most effective when sprayed on new growth and young plants. Take care to avoid treating areas with desirable native grasses or fescues.

*Observe all precautions and follow manufacturer’s recommendations for application.

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