Is black medic a weed?

It is often considered a lawn weed, though it provides ecological benefits like nitrogen fixation.

Does it need much water?

It is quite drought tolerant once established and prefers well drained soil.

Plant guide

Black medic.

Medicago lupulina L.

Pronounced meh-dih-KAY-go loo-poo-LEE-nah

Also known as Black Medic, Black Medic Clover, Black Medick, English Trefoil, Hop Clover, Hop Medic, Hop Trefoil

Medicago lupulina — Photo by Dan Johnson (CC BY) via gbif

Black medic is a hardy, low growing legume that often acts as a ground cover. It is frequently found in lawns and disturbed areas where it fixes nitrogen in the soil. You will notice its small yellow flowers and clover like leaves throughout the growing season.

Another photo of Black medic — Photo by Tereka Lasso (CC BY-SA) via iNaturalist

At a glance

Care level: Easy
Plant type: Herbaceous annual or short lived perennial
Light: Full sun
Indoor light: Direct sun
Water: Every 7 to 14 days
Mature size: 1 to 2 feet
Growth rate: Fast
Hardiness: USDA 3 to 9
Bloom time: Late spring to early autumn

Care

This plant thrives in full sun and tolerates a wide range of soil conditions. Watch for yellowing leaves which might indicate poor drainage or nutrient issues. It is quite drought tolerant once established.

Watering: Water only when the top inch of soil feels dry to the touch.
Feeding: It rarely needs fertilizer as it fixes its own nitrogen.
Pruning: Trim back stems if the plant starts to look messy or spreads too far.
Repotting: Repot only if the plant becomes root bound in its container.
Soil: Well draining soil
Soil pH: 6.0 to 7.5
Temperature: -20 to 35°C
Humidity: 30 to 70%
Drought tolerance: High
Lifespan: Annual or short lived perennial.
Deer and rabbits: Moderate

Safety

People: There are no known significant toxicity issues for humans.
Pets: This plant is generally considered non toxic to cats and dogs.
Children: The small seeds and pods could pose a minor choking hazard if ingested by small children.
Contact allergens: Handling the stems may cause mild skin irritation in sensitive individuals.
Airborne allergens: The pollen can trigger mild seasonal allergies in some people.
Edibility: While not toxic, it is generally considered unpalatable and is not a standard human food source.

How to identify it

Three leaflets with serrated edges
Small clusters of bright yellow flowers
Kidney shaped seed pods turning black
Prostrate stems spreading along the ground

Height: 0.1 to 0.6m
Spread: 0.2 to 0.8m
Leaves: green, deciduous
Flowers: yellow, 0.3 to 0.5cm
Fruit: black, Summer to autumn

Problems to watch for

Alfalfa WeevilCommon
Powdery MildewCommon
AphidsUncommon
Clover Root CurculioUncommon
Leaf SpotUncommon
RustUncommon

By symptom

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Growing it

Propagation: seed
When to plant: spring, autumn
Overwintering: In colder regions, the plant will die back to the ground. No special protection is needed as it often reseeds itself.
In containers: It is not typically grown in containers as it is a sprawling ground cover.

Direct Sowing

1. Clear a patch of soil in a sunny location.
2. Scatter seeds thinly over the surface in spring.
3. Lightly rake the soil to cover the seeds.
4. Keep the area moist until germination occurs.

Use this plant as a living mulch in vegetable gardens to naturally boost soil nitrogen levels.

Grows well with

Kentucky Bluegrass — They often grow together in pastures where the medic provides nitrogen to the grass.
White Clover — Both are low growing legumes that support similar pollinator populations.

Similar species

Yellow Clover — It has a similar yellow flower head but different leaf structure.
Black Medic — This is the primary species in its group.

Science

Family: Fabaceae
Genus: Medicago
Order: Fabales
Class: Magnoliopsida
Native range: Europe, Western Asia, and North Africa.
Conservation: It is a common and widespread species with no special conservation concerns.

It thrives in disturbed, sunny habitats by quickly colonizing bare ground and enriching the soil.

Value to wildlife: nectar source, larval host plant
Pollinators: bees, butterflies
Uses: soil improvement, ground cover, forage crop

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Soil reaction: 7/9
Light: 7/9
Moisture: 4/9
Salinity: 2/9
Temperature: 5/9
Nutrients: 4/9

Taxonomy resolved against GBIF.

Questions people ask

Is black medic a weed?: It is often considered a lawn weed, though it provides ecological benefits like nitrogen fixation.
Does it need much water?: It is quite drought tolerant once established and prefers well drained soil.

Where the name comes from

The genus name Medicago refers to Media, an ancient region where the plant was thought to originate, while lupulina refers to its resemblance to hops.

Good to know

It is often called black medic because of its dark, kidney shaped seed pods.
The plant is a member of the pea family and forms symbiotic relationships with nitrogen fixing bacteria.
It is frequently found in lawns and disturbed soils across the globe.

Also in

Drought-tolerant plants

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This guide was generated with AI and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.