Newspaper and cardboard as a weed barrier
Sheet mulching is an extension-recommended way to smother weeds.
Evidence: University extension guidanceProfessional review not claimed
What the sources say
Oregon State University Extension describes sheet mulching with cardboard as a quick, inexpensive way to protect garden beds of any size from weeds.
Evidence assessment: University extension guidance. This describes the scope of the guidance we checked, not proof that the remedy works for you.
Cautions
- Remove plastic tape and glossy labels from cardboard first.
No method is given for this entry. The guidance we checked discourages this use or shows it does not do what tradition claims.
Ingredients & category
Sources
- OSU Extension: Sheet mulching with cardboard — link and wording checked 30 September 2026
Source-checking is not clinical or veterinary review. Specific historical origin not established from the source reviewed.