# Weed Smothering With A Tarp In A No Dig Garden

- Link: https://lifeandwork.blog/weed-smothering-with-a-tarp-in-a-no-dig-garden/
- Published: 2026-09-27T16:48:34-05:00
- Author: Bert Swope

![Simple Ways To Kill Cover Crops With A Tarp In A No Dig Garden](https://i0.wp.
com/i.imgur.com/wUdPJJP.jpeg?w=790&ssl=1)

Weed smothering with tarps is an efficient, low-maintenance way to prepare your 
garden for planting. Tarps also help protect fragile soil ecosystems from disruption
by mechanical devices like rototillers and ploughs.

No-till methods rely on maintaining healthy soil structures to create quality topsoil,
and tarps help increase plant-available nitrogen for crops.

## 1. Put the Tarp Over the Crop

Tarps can quickly create garden beds in existing grassy areas or suppress weeds 
before planting new crops. For optimal results, choose dark-colored tarps which 
absorb heat and help maintain lower soil temperatures.

Contrary to tillage, using tarps can save both fuel and labor hours while not disturbing
soil structure or biology. Furthermore, they enable soil water retention, while 
preventing any rainwater pooling up or leaking into bed spaces.

Breckbill and Fagan found that three week tarping of cover crops proved effective
at terminating cover crop growth while simultaneously restricting perennial weed
growth, while shorter duration tarps did not significantly reduce weeds or create
more productive seedbeds.

Additionally, tarps were found to increase plant-available nitrogen (nitrate) levels
in the soil over three weeks – this increases crop yields due to increasing crop
nutrient availability. Furthermore, they maintained steady soil temperatures while
improving direct-sown seed germination.

## 2. Pull the Tarp Over the Crop

Tarping has become an increasingly popular practice among no dig gardeners who need
to prepare beds before planting, offering many advantages such as terminating cover
crops, eliminating weeds and creating a seedbed with uniform seeds, conserving moisture
levels in soil, increasing nitrate levels in soil and speeding up residue decomposition.

Beneficial insects and earthworms remain active within a cover crop, helping maintain
soil health while also expanding fall and spring planting windows. Unfortunately,
dense growth allows earwigs to hide under its thick cover, damaging flowering plants
or cut flowers in the process.

Cooperators tested four tarping treatments over four weeks – leaving the tarp on
for one, two, three, and four weeks each time – and found that while one week did
not effectively kill cereal rye and only prevented weeds, two, three, and four week
treatments were statistically comparable in their effectiveness. Future research
should investigate how weather and accumulation of Growing Degree Days affect outcomes
from this method of tarping.

## 3. Pull the Tarp Over the Weeds

Weeding can be one of the biggest challenges of no dig gardening. Weeds steal nutrients,
restrict airflow, and introduce pests – each minute spent weeding is time lost from
planting or harvesting crops instead. Silage tarping allows you to eliminate weeds
before they become an issue, thus decreasing labor costs and making your garden 
more profitable.

Tarping is an effective, heavy-duty plastic method utilized in no dig systems to
suppress weeds and improve soil biology. It works by depriving weed seeds of light,
killing them before they have the chance to germinate. Furthermore, black sides 
absorb heat which forces seeds out into the open where they eventually sprout and
die, while the white sides act to moderate temperatures while ensuring optimal soil
temperatures.

Cut and place a tarp of appropriate size over the target area, anchoring it securely
to the ground using sandbags, rocks, filled erosion socks, duck-billed anchors or
U-nails. Make sure it extends at least one foot beyond the targeted area to prevent
new shoots from emerging underneath it.

## 4. Remove the Tarp

Growers adhering to organic standards find that tarping is the simplest, most efficient
way to suppress weeds before planting. By blocking light, opaque tarps eliminate
any new weeds that had germinated prior to being covered by an opaque tarp.

Tarps can help moderate soil temperatures and maintain optimal moisture levels to
promote seed germination and decomposition, and also protect against erosion caused
by rainwater runoff or snow melt. They protect the ground surface from erosion as
well as pooling caused by rainfall or snowmelt, helping prevent soil pooling or 
erosion caused by rainfall or snow melt.

Once a cover crop has died, using a tarp can quickly prepare beds for direct-seeded
crops like carrots and radishes to be directly planted in rows. Tilling and amending
will help ensure the best seedbed for new veggies to take hold in.

Some farmers use tarps instead of conventional no-till or shallow-till practices,
resulting in significantly increased plant available nitrogen (ppm). More research
needs to be conducted into how tarping affects soil microorganisms and other crucial
ecosystem functions; nevertheless, farmer experience and our own experimental trials
indicate tarps as essential tools for no-till and organic vegetable growers.

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