Cardboard Mulch Cut Weed Growth in 2022 Idaho Study
Gardeners using cardboard as a weed barrier may save time and improve crop yields, according to USDA-funded trial findings.
Updated on Oct. 14, 2026 in Organic Food
Live Poll
Would you use cardboard to control weeds in your own garden beds?
A 2022 USDA-funded trial at Sweet Hollow Farm in Idaho found that covering garden beds with cardboard significantly reduced weeds compared to traditional tilling. The research offers a practical strategy for home gardeners looking to minimize soil disturbance.
Why it matters
The study highlights a non-chemical, low-labor approach to managing garden health by suppressing weed growth without the need for intensive soil tilling. This shift can decrease the physical effort required for garden maintenance while potentially boosting vegetable output.
In a trial comparing four 30-meter raised beds treated with cardboard and compost against four tilled control beds, cardboard significantly outperformed tilling. By the second season, the cardboard beds showed substantially lower weed coverage and improved harvest yields for multiple squash and allium crops.
The players
USDA
The United States Department of Agriculture is a federal agency responsible for developing and executing policy on farming and food production.
University of Wyoming
A public land-grant research university that partnered on the trial to study agricultural cultivation methods.
The details
The experimental method involved layering cardboard atop raised beds to create a physical barrier that prevents weed germination by blocking light. This 'no-till' approach preserves soil structure and moisture, creating a more stable environment for root systems. Weeding the cardboard-covered beds took an average of 55 minutes, less than half the two-hour effort required for the traditional tilled beds.
Timeline
2022: The USDA funded the cardboard gardening trial.
2023: Onion and shallot crops produced higher yields on cardboard.
Health Landscape
This study aligns with the broader movement toward regenerative agriculture, which seeks to restore soil health by minimizing the disruption caused by tilling. It sits within a growing body of research exploring low-impact gardening techniques as effective, sustainable alternatives to chemical-heavy land management.
If you are planning your garden, using cardboard as a mulch may reduce the time you spend weeding and help keep your soil structure intact. Consider discussing with your local nursery or county extension office whether this method is appropriate for your specific soil type and vegetable varieties.
The takeaway
Using cardboard as a barrier is a low-cost, low-effort way to suppress weeds and potentially increase yields in your garden. For your next growing season, consider keeping a simple log of the time you spend weeding to see if alternative mulching methods make a measurable difference in your labor.
Further reading
For more on sustainable garden practices, explore our Organic Food section.
Source note: This article includes information reported by The Times of India.
Live Poll
Would you use cardboard to control weeds in your own garden beds?
