The illustrated growing guide
Alfalfa
Medicago sativa
Family Fabaceae
Est. zones 3-10
The deepest-rooted soil-builder in the legume world — its taproot mines minerals from the subsoil (a true dynamic accumulator) while fixing nitrogen and feeding bees. Grown as a perennial green manure, chop-and-drop mulch, tonic-tea leaf, and salad sprout. It wants sweet, deep, well-drained soil (add lime to acid ground) and then works for years.
Full Sun
Low water
Fast growth
Attracts beesI
Overview
Will alfalfa suit your garden, and what goes wrong.
Will it fruit where you are?
Enter your ZIP — we look up your USDA hardiness zone (2023 map) and check it against what alfalfa actually needs.
Hardy inZones 3-10Alfalfa at a glance
Common alfalfa problems
- Alfalfa Weevil
- Aphids
- Almost none in a garden setting
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Growing
Light, water, soil, propagation and the season’s jobs.
How to grow alfalfa: light, water & soil
How to plant & propagate alfalfa
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The year
What alfalfa asks for, month by month.
The alfalfa year, month by month
BloomWhat each band means
- Bloom — flowers open — pollinators working, frost on blossoms is the danger.
The alfalfa year as text
- Jan quiet month
- Feb quiet month
- Mar quiet month
- Apr quiet month
- May quiet month
- Jun bloom
- Jul bloom
- Aug bloom
- Sep quiet month
- Oct quiet month
- Nov quiet month
- Dec quiet month
These are the species' typical months — expect them a few weeks earlier in warm zones and later in cold ones. Watch the plant, not just the calendar.
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Ecology & uses
What it does for the garden, and what it is grown for.
Alfalfa in the garden system
- Herbaceous layer perennial
- N-fixer
- Dynamic accumulator
- Nectary/insectary
What alfalfa is grown for
✓ Commonly eatenleaves/sprouts a traditional tonic; seeds sprout for salads
Harvesting & storing alfalfa
Cover crop / dynamic accumulator; leaves for tea and sprouts; premier livestock forage.
Edibility, identification, and traditional-use notes here are general reference — not medical or veterinary advice, and not a claim that any plant treats or prevents anything. Medicinal ratings record how strongly a plant features in herbal tradition, nothing more. Never eat or dose a plant you have not positively identified. More on how to use this library.
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Cultivars
Named varieties of alfalfa, ruled as a catalogue.
Best alfalfa varieties & cultivars
'Vernal' (hardy); low-growing cover-crop types
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Sources & plant ID
Where the care distinctions come from, and how the plant is filed.
Research basis
Sources behind this profile
No extension citations are attached to alfalfayet. The care figures below come from the library's own catalogue rather than a traced primary source.
Plant ID
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Where to buy
Third-party nurseries — not Story Thyme Farms.
Third-party nurseries, not Story Thyme Farms. Prices are theirs.
Story Thyme Farms may earn a small commission from these links, at no cost to you — it never changes what we recommend.
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Questions
Alfalfa questions, answered straight.
Is alfalfa safe for kids and pets?
Alfalfa is commonly eaten and isn't considered toxic, but "commonly eaten" isn't a guarantee for any particular person or animal — allergies, quantity, and which part you eat all matter. One caveat on this one: leaves/sprouts a traditional tonic; seeds sprout for salads. Never eat a plant you haven't positively identified, and check with a vet before letting pets or livestock graze anything new.
When do you harvest alfalfa?
Cover crop / dynamic accumulator; leaves for tea and sprouts; premier livestock forage.
How do you propagate alfalfa?
Division or seed.
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Elsewhere
Where alfalfa sits in the library.
Phacelia (Lacy Phacelia)
Crimson Clover
White Clover
Hairy Vetch