Bryan McAllister’s personal reference notebook
July 30, 2026Short & citedBlog
Civic Viewpoint.
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Kept by Bryan McAllister — short guides, clear facts, and the Canadian angle when it matters.
Field Notes • Plant

Alfalfa

Alfalfa (*Medicago sativa*) is a perennial leguminous plant in the pea family (Fabaceae) that is widely grown as a forage crop.

Updated July 30, 20261 min readCited sources

Alfalfa is a perennial leguminous plant grown as a forage crop. It is valued for its high nutritional quality and deep root system.

What it is

Alfalfa (Medicago sativa) is a flowering perennial in the pea family (Fabaceae). It has trifoliate leaves, racemes of small flowers, and spirally coiled seed pods. The plant grows in clumps and develops a deep taproot, allowing it to persist for several years.

Why it matters

Alfalfa is a key livestock feed, used as hay, pasture, or silage. It is rich in protein and digestible energy, and its deep roots improve drought tolerance. As a legume, it fixes nitrogen, enriching the soil for subsequent crops. In Canada, it is an important forage crop and can also become a competitive escaped plant in some areas.

Key details

Alfalfa likely originated in south-central Asia or Asia Minor and spread through North Africa, Europe, and the Americas. It is now cultivated in temperate and subtropical regions worldwide. Beyond forage, it is used for green manure, erosion control, and wildlife cover.

In short

  • Alfalfa is a perennial legume grown for livestock forage.
  • It fixes nitrogen and improves soil fertility.
  • Deep roots make it drought-tolerant.
  • Also known as lucerne in many regions.
Canadian angle

Alfalfa is grown in Canada as an important forage crop for livestock, and it can also be considered a competitive escaped plant in some areas.

Quick questions

What is alfalfa?
Alfalfa is a perennial legume, Medicago sativa, grown mainly as a forage crop for livestock.
Is alfalfa the same as lucerne?
Yes. Lucerne is another common name for alfalfa.
Where does alfalfa come from?
It is generally considered native to south-central Asia or Asia Minor.

Sources

  1. USDA NRCS — https://plants.sc.egov.usda.gov/DocumentLibrary/factsheet/pdf/fs_mesa.pdf
    Supports: Scientific name, perennial legume status, and forage-crop identification.
  2. Encyclopaedia Britannica — https://www.britannica.com/plant/alfalfa
    Supports: Definition as a perennial cloverlike leguminous plant and primary use as hay, pasture, and silage.
  3. UMass Amherst — https://www.umass.edu/agriculture-food-environment/crops-dairy-livestock-equine/fact-sheets/alfalfa
    Supports: Origin in Asia Minor, Arabic name meaning, and historical spread.
  4. University of Maine Extension — https://extension.umaine.edu/publications/2245e/
    Supports: Morphology, plant habit, flowers, seed pods, lifespan, and yield information.
  5. USDA NRCS — https://www.nrcs.usda.gov/sites/default/files/2022-09/Alfalfa.pdf
    Supports: Deep-rooted perennial legume, forage importance, soil improvement, erosion control, and wildlife cover.
  6. Budburst — https://budburst.org/plants/8
    Supports: Native/introduced status and occurrence as an escaped, weedy plant in parts of the US and Canada.