Science · Plants, Natives & Crops
Sweet Clover
Sweet clover includes yellow and white species with annual or biennial forms, so species and cultivar identity matter. Deep rooting, drought adaptation, and nitrogen fixation make it useful for biomass production and soil improvement, but seed persistence and livestock feed safety require attention.
Profile
- Taxonomic scope
- The common name covers more than one Melilotus species.
- Life cycle
- Annual or biennial, depending on species and cultivar.
- Roots
- Deep-rooted legume used to improve soil structure.
- Nitrogen
- Fixes atmospheric nitrogen with compatible rhizobia.
- Seed management
- Seed production can lead to weediness and volunteers.
Water & soil context
- Moisture (VWC)
- The cited publications do not provide numeric volumetric water content sensor targets.
- Salinity tolerance
- The California chart rates sweetclover salinity tolerance as fair, without a numeric threshold.
- Drought tolerance
- The California chart rates drought tolerance as good and describes it as especially drought tolerant among clover-type cover legumes.
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.
Established-plant drought tolerance should not be interpreted as permission to establish seed in dry soil without adequate rainfall or irrigation.
Problems to watch
- Moldy sweetclover forage can cause anticoagulant poisoning in livestock.
- Prevent unwanted seed production where volunteers would interfere with later crops.
- Some types can host nematodes.
Stress signs
- The cited sources do not provide a reliable species-specific list of visible plant stress indicators.
Where you'll find it
- Green manure
- Soil-improving cover crop
- Forage
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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.