Science · Plants, Natives & Crops
Hairy Vetch
Hairy vetch is grown for nitrogen contribution, biomass, and soil protection, often alongside a cereal companion. Its relatively late development makes termination timing important when balancing biomass production against planting the following crop.
Profile
- Life cycle
- Cool-season annual, commonly managed as a winter annual.
- Roots
- The California NRCS chart describes a taproot reaching approximately 1–3 feet.
- Drought adaptation
- Rated as having good drought tolerance in the California chart.
- Nitrogen
- Biological nitrogen fixation depends on effective nodulation.
- Seed persistence
- Hard seed can create volunteers in later crops.
Water & soil context
- Moisture (VWC)
- The cited publications do not provide numeric volumetric water content sensor targets.
- Salinity tolerance
- The cited crop descriptions do not establish a numeric salinity threshold.
- Drought tolerance
- Relatively drought tolerant compared with other vetches, according to the California chart.
Illustrative monitoring-depth band
3–8 in
Editorial placement example, not a validated optimum or total rooting depth. Confirm the site's root distribution and soil horizons; multiple depths may be needed.
Drought tolerance does not eliminate establishment moisture needs or competition with the following crop for stored soil water.
Problems to watch
- Hard seed can cause persistent volunteer problems.
- May harbor western tarnished plant bug, twospotted spider mite, and reniform nematode.
- Termination effectiveness depends on growth stage; cutting too early may leave surviving plants.
Stress signs
- The cited sources do not provide a reliable crop-specific visual stress diagnosis list.
Where you'll find it
- Cover crop
- Green manure
- Weed-suppressing residue
More plants, natives & crops
Published botanical and soil references are distinct from GroundWorx product guidance. Moisture thresholds and monitoring depths require site calibration; sources do not establish product performance or diagnose stress.