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How to Keep Weeds Out of the Garden

When nature is allowed to take over your garden space, it becomes a survival of the fittest contest for plants. After a year or two of negligence, a garden bed will become overrun with fast-growing weeds.

These aggressive plants work by growing and spreading quickly. In doing so, they can suppress your vegetable seedlings in the process. There are many methods for weed control in the garden, but we prefer to only use non-chemical techniques.

In this article, we will share a few options for how to keep weeds out of the garden. Some require a little more elbow grease than others, so start with the method that works best for your situation.

Pepper garden 2020

1. Cover With Black Tarp

Without sunlight for photosynthesis, most weeds will die off quickly. You’ll know about this if you’ve ever left a kiddy pool on the lawn for a few days – the grass below turns yellow and begins to die!

One of the simplest methods for killing existing weeds in the garden is to cover the area with a light-blocking tarp. A heavy-duty tarp will work best, but you can also use thick black plastic to block out all of the sun’s energy.

Note: This process is different from ‘solarizing’ a garden bed which uses clear plastic to allow sunlight to over-heat your soil to kill off weeds and bacteria.

How to kill weeds with a tarp:

  • Cover the area with tarp. I recommend going a bit larger than the surface area of the garden bed to close off the edges completely. Otherwise, the weeds may emerge from the sides and stay alive with sunlight.
  • Bury edges or secure with stakes. Once covered, I recommend digging a small trench around the edges of the tarp and burying it. You can also use garden pins to secure the edges. This will keep traveling root systems from entering or leaving the gardening area beneath the tarp.
  • Weigh down with rocks or cinder blocks. To prevent heavy winds from blowing the tarp away, use heavy objects to keep it in place. The large surface area of a tarp is susceptible to catching the wind, so place rocks or cinder blocks around the edges and in the middle of the tarp.
  • Leave covered for several weeks. After a few days, the weeds will begin to die, but to be sure that they are completely gone, I recommend leaving the tarp for 4-8 weeks. This allows enough time for the root systems to die and begin decomposing in the soil. Check on your soil weekly to monitor progress.
  • Remove the tarp. Once the weeds are mostly gone and you are preparing to plant, remove the tarp and store it for a future use. Then, pull out any remaining weeds and roots (only the hardiest will have survived).
  • Amend with compost and plant garden. After the weeds are gone, you should plant your garden right away. Keep the soil actively planted with the crops that you want in the garden before more unwanted seeds find their way to your soil.

It is best to do this during the late winter months when the garden is not in use, but can also be done during the summer if necessary. The process takes weeks to months, depending on how hardy the weeds are.

2. Use Mulch

When starting from scratch in a new garden bed, stay ahead of the weeds by mulching heavily around your crops. There are many different types of mulch that can be used to suppress weeds.

Types of Garden Mulch:

  • Straw. Straw is made up of dried stalks of cereal plants. We specifically recommend straw, not hay, for mulching the garden. This is because straw does not have any seeds that can germinate in your soil. Spread a nice, thick layer of straw all around your plants to keep weeds out of the unused garden soil. Straw can be bought in bricks or bales from local livestock supply stores. Spread
  • Grass clippings. If you have a lawn, the grass clippings that you generate from mowing are perhaps the best mulch available. The clippings can be used fresh or dried as a mulch in the same way as straw.
  • Weed control fabric. If you are looking to create a neat-and-tidy garden look, there are garden fabrics made specifically for suppressing weeds. They usually come in a large roll that is 4′ wide, and can be cut to the size of your garden. Then, the fabric is staked into place with metal pins, with holes cut out for your garden crops. They allow air and water to penetrate, but do not allow light to reach the soil below. Tip: Get the high-quality fabric, as the cheap stuff tends to disintegrate by the end of the season.
Straw-mulched pepper plants – recommend going thicker.

There are many additional benefits to mulching in the garden aside from weed suppression. One perk is an increased water retention in the soil beneath the mulching. The water near the surface of the soil will not evaporate as quickly and can be stored for use by your plants for longer.

Another benefit of mulching is temperature control. If you are expecting colder weather, a thick layer of mulch will help keep the root system at a consistent temperature. This is especially important for crops that are not cold-hardy (like peppers!).

3. Use a Weeding Haoe

We love this gardening tool for weed control. The simple tool has a long, wooden handle with a loosely-fitted, thin blade for cutting underneath weeds. The blade destroys weeds by slicing their root systems.

Weeding hoe
Garden weeding hoe tool.

These are usually hard to find in stock at the local hardware stores due to high demand. We were lucky enough to find one at Home Depot, but they are available online at Amazon for a similar price.

The key with this tool is to use it on young weeds, before they can grow to be large with thick roots. If you are trying to tackle massive, overgrow weeds, the weeding hoe may not be up to the task. You just might end up with more blisters on your hand than it was worth.

In short, keep on top of weeding the garden with this slicing tool and your job will be a lot easier throughout the season!

4. Plant More Crops

One of my favorite methods for suppressing weeds is to plant more crops in your garden beds. Improper plant spacing can cause wasted soil space, inviting weeds to take over.

By spacing your veggies closer, and interplanting smaller plants in any gaps, your take up as much garden space as possible. Your plants shade the soil below, preventing any weed from dominating.

Plus, using your soil is great for keeping the soil microbiome healthy. The best soils are those that have plants growing in them at all times. It helps prevent erosion and protects valuable worms and microorganisms from harsh sunlight.

5. Hand Pull Weeds Regularly

If you want to go old school, you can of course hand-weed the garden. If you don’t mind getting your hands dirty and enjoy spending time in the garden, this process can be therapeutic and rewarding.

Again, the key here will be to stay on top of the weed control. As soon as they are allowed to establish a strong room system, hand-weeding becomes a much more grueling chore.

Calvin in the pepper field

Common Garden Weeds

  • Crabgrass. Thrives in hot weather and can handle drought. Self-propagating and can spread via roots. Like any garden weeds, be sure to remove the entire root system to get rid of this!
  • Foxtail. Clustering grass that grows quickly and can be very tall. Can be poisonous for pets and other wild animals.
  • Purslane. Though it is edible and sometimes eaten in salads, purslane is an invasive weed that can take over the garden if left to its own whim.
  • Bluegrass. Another type of grass, annual bluegrass can grow fast in the garden bed. As with any grass, it is essential to remove all of the roots and to get them out before they have a chance to establish.
  • Velvetleaf. This annual weed can grow to be 8′ tall if left unchecked. It was originally native to southern Asia but is now commonly found across the globe.
  • Dandelion. Commonly found in lawns and fields, dandelion is a nuisance in the garden. However, the plant is also edible and is thought to have many health benefits.
Dandelion weed.

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I hope this article helps you learn how to keep weeds out of the garden. Weeding is a chore that can be largely avoided with good preparation. Let us know any other methods you have had success with – we like learning new ways to garden!

Calvin Thumbnail


One of the original Pepper Geeks! When Calvin isn’t gardening or learning more about peppers and botany, he might be traveling new places or playing some music.