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Hairy vetch cover-crop mulch for tomatoes: does it work?
Sources (0)
Proven Consistent benefit shown in replicated field research or long-running extension trials.
Tomatoes transplanted into mowed hairy vetch outyielded bare soil and black plastic in USDA-ARS Beltsville trials.
- Abdul-Baki A.A., Teasdale J.R. (1993). Winter annual legumes and grasses as mulches for fresh-market tomatoes. HortScience 28(5) (USDA-ARS Beltsville).
- Abdul-Baki A.A. et al. (1996). Fresh-market Tomato Production in a Low-input Alternative System Using Cover-crop Mulch. HortScience 31(1):65.
Mechanism
Legume mulch supplies nitrogen, conserves moisture and moderates soil temperature.
What the research found
- Fresh-market tomatoes: about 85 t/ha with hairy vetch mulch vs 36 t/ha bare soil and 44 t/ha black plastic (Abdul-Baki & Teasdale 1993).
- Low-input cover-crop mulch systems for fresh-market tomato evaluated further at Beltsville (Abdul-Baki et al. 1996).
Caveats
Mid-Atlantic results. Vetch must be killed (mowed/rolled) at the right stage; it can reseed and become weedy.
How to try it
Sow hairy vetch in fall, mow/roll in late spring, transplant tomatoes into the residue.
Other Proven pairings (4)
- Three Sisters: corn, beans and squash
- Sweet alyssum with lettuce for aphid control
- Blue Hubbard squash as a perimeter trap crop for cucumber beetles
- Push–pull: maize with Desmodium and Napier grass
Evidence summary checked 2026-10-14. We cite only peer-reviewed studies, university extension and USDA/ARS sources; results may differ in your region. Not professional advice.