How To Prevent Weed Seeds From Germinating

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Learn how to prevent weeds and keep weeds from growing in your garden, lawn, and other landscaping areas with these gardening tips from HouseLogic. Learn how to kill weed seeds in soil to prevent weeds and other invasive grasses from continuing to sprout every year. Listed in this article are 5 effective ways to minimize weed growth in your garden / turf / landscape with Mirimichi Green.

Weed Control Tips to Prevent Them From Ever Sprouting

Unlike seeds and plants you buy from catalogs and nurseries, indigenous common weeds are naturally suited to the sun, soil, and water conditions of your garden. That’s why weed control is so hard.

But if you prevent weed seeds from germinating, your garden will be weed-free. Here are some surefire ways to keep weeds from growing in the first place.

Don’t Disturb the Soil

Weed seeds “sleep” in your soil all the time, just waiting for sunshine to enable them to germinate. Left underground, many weed seeds remain dormant for years. So the less you disturb the soil, the more likely weed seeds will remain asleep.

Avoid high-powered tillers, and go easy on the hand cultivating. Sow your flower and vegetable seeds above the ground in mounds of compost, shredded leaves, or even in bags of topsoil. Better yet, plant seedlings and starts.

Smother Weed Seeds

Another way to keep seeds asleep is to cover your soil with sun-blocking organic or synthetic mulches.

Organic mulches — hardwood mulch, newspaper, cardboard, straw — degrade in a few months and improve soil structure and add nutrients. Synthetic mulches — landscaping paper, plastic — can last several seasons, but won’t help rebuild soil when they eventually degrade.

Heed these mulching tips:

  • Wet the ground before you lay down layers of paper, which will prevent the paper from blowing away while you work.
  • Scout yard sales for old carpet and wallpaper, efficient sun blocks that prevent weeds.
  • Spread mulch 2 to 4 inches deep to suppress weeds and retain moisture.
  • Always pick straw, not hay, to prevent weeds. Hay usually contains hayseeds, which will sprout where you’re trying to keep weeds out.

Learn more with our handy mulch guide.

Wage a Chemical Attack for Weed Control

Pre-emergent herbicides prevent weed seeds from germinating, but don’t kill existing plants and grasses.

The exact timing for applying a pre-emergent herbicide is hard to pinpoint because you must spread the herbicide before seeds germinate, which happens underground at different times.

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Conventional gardening wisdom says spread pre-emergent herbicides when the daffodils pop or the forsythia wilts. But advance planning is the best way to determine when to spread. Log the date when you see the first weeds in your garden, then subtract three weeks to arrive at the date you should spread the pre-emergent herbicide next spring.

Grow Plants Close Together

The closer together you plant your flowers and vegetables, the less space weed seeds will have to grow.

If you double-dig — loosen (don’t pulverize) soil at least 2 feet down — you can plant cheek-by-jowl, because plant roots can grow down, not out, to find water and nourishment. If you plant intensively in a diamond-shaped pattern — rather than rows — you’ll avoid barren spots where weeds will grow.

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

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.
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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

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.

5 Ways To Minimize Your Weed Growth

There are always weed seeds that lie dormant in the soil. The seeds are waiting for the sunshine to start to germinate or be awoken from a long slumber. To avoid awakening the weed seeds, don’t disturb the soil. Disturbing the soil includes tilling and cultivating. But that seems somewhat impossible when trying to plant new flowers, plants or grass. When planting flowers or plants, sow the seeds above the ground in a small mound of topsoil or compost.

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2. Fight the weeds before they sprout

An effective way to prevent weeds is by using a pre-emergent herbicide that will stop weed seeds from ever germinating but won’t kill existing plants and grasses.

The tricky part is determining when to apply a pre-emergent because it must be applied before the weed seeds have time to germinate underground. The best way to know when to apply a pre-emergent is to make note of the date when you see the first weeds in the yard or garden. Then, mark your calendar 3 weeks before that date for next spring and apply the pre-emergent then.

You can also start from scratch by using a non-selective herbicide. This will kill whatever it sprays. It is also recommended to use organic options to prevent harmful synthetic build up in the soil. A great option is Mirimichi Green Weed Control. It is organic, OMRI listed and will show results in 24 hours.

3. Promote healthy plants & grass

If there is healthy grass, weeds will have less room to grow in the lawn. To promote a healthy lawn, reseed bald patches and fertilize if a soil suffers from nutrient deficiencies. By maintaining a healthy lawn, fewer weeds will arise. Nutri-Turf has the ideal balance of nutrients for all grass types and will keep the lawn lush.

4. Keep your plants close

Planting closely together will provide more shade to the soil below, which will prevent weed seeds from getting sunlight and allow less room for weeds to grow. You can usually reduce the recommended planting space on the packaging by about 25 percent. However, most spacing recommendations are based on the prediction that adjoining plants will not touch at their mature size, so follow the guidelines if you are planting plants that are prone to foliar diseases.

5. Create an organic barrier

Spreading an organic barrier around plants will submerge weed seeds and prevent light from starting germination all while keeping your plants cool. Organic barriers are best such as mulches. Mulches can host crickets and carabid beetles, which will feed on weed seeds. To create the organic barrier, spread mulch 2 to 4 inches deep around your plant bed.

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