Lucerne
Medicago sativa
Lucerne, or Medicago sativa, is a versatile legume known for its high nutritional value and ability to enrich soil. Originating from the Mediterranean region, it is widely grown as forage for livestock and as a cover crop, making it a favorite among farmers and gardeners alike.
Everything it needs
9 essentials at a glance
Watering
Medicago sativa, commonly known as Lucerne, requires consistent moisture, particularly during germination and establishment.
Water the plants deeply once a week, ensuring the soil is moist but not waterlogged. During dry spells, increase watering frequency to twice a week. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause wilting and stunted growth.
Light
Lucerne thrives in full sun, requiring at least 6 to 8 hours of direct sunlight daily.
Ideal placement includes open fields or gardens that receive ample sunlight throughout the day. While it can tolerate partial shade, reduced light can affect growth and yield.
Soil
This plant prefers well-draining soil rich in organic matter, with a pH range of 6.0 to 7.5.
A sandy loam or clay loam is ideal, as it allows for good drainage while retaining necessary moisture. Consider using a potting mix designed for legumes if growing in containers.
Humidity
Lucerne prefers moderate humidity levels, around 40% to 60%.
To increase humidity, consider misting the plants or placing a humidifier nearby. Signs of low humidity stress include browning leaf tips and poor growth.
Temperature
The ideal temperature range for Lucerne is between 60-75°F (15-24°C).
It is hardy in zones 3-10, tolerating cold down to 20°F (-6°C) and heat up to 95°F (35°C). During extreme temperatures, ensure adequate watering to help the plant cope.
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10, applying it every 4-6 weeks during the growing season.
In spring, apply a higher nitrogen fertilizer to promote lush growth. Signs of nutrient deficiency include yellowing leaves and poor growth, indicating the need for fertilization.
Pruning
Pruning is generally not necessary for Lucerne, but regular harvesting can encourage bushier growth.
Use sharp, clean shears to cut back the plant, removing any dead or damaged stems. Deadheading is not applicable, as this plant is primarily grown for its foliage and forage.
Repotting
If growing in containers, repot Lucerne every 2-3 years or when it becomes root-bound.
Signs it needs repotting include roots growing out of the drainage holes and stunted growth. Choose a pot 1-2 inches larger in diameter, and ensure it has good drainage. Carefully remove the plant, loosen the roots, and place it in the new pot with fresh soil.
Propagation
Lucerne can be propagated through seeds.
Sow seeds directly into the soil in early spring or fall, about 1/4 to 1/2 inch deep, spacing them 1-2 inches apart. Keep the soil moist until germination, which typically occurs within 7-14 days. Ensure a well-prepared seedbed for optimal growth.
When it's unhappy
Yellowing leaves
Why it happens
This can be caused by nutrient deficiency or over-watering.
How to fix it
Check soil moisture levels and adjust watering accordingly. Fertilize with a balanced fertilizer to address nutrient deficiencies.
Wilting
Why it happens
Wilting can occur due to under-watering or root rot.
How to fix it
Ensure consistent watering, and check for root rot by inspecting the roots. If rot is present, remove affected roots and repot in fresh soil.
Pest infestations
Why it happens
Common pests include aphids and spider mites, which can weaken the plant.
How to fix it
Inspect plants regularly and treat infestations with insecticidal soap or neem oil as needed.
Poor growth
Why it happens
This may be due to inadequate sunlight or poor soil quality.
How to fix it
Ensure the plant receives full sun and amend the soil with organic matter to improve fertility.
Fungal diseases
Why it happens
Overly wet conditions can lead to fungal infections like root rot or leaf spot.
How to fix it
Improve drainage and avoid overhead watering. Remove infected plant parts and apply fungicides if necessary.
Care through the year
Spring
In spring, focus on fertilizing with a nitrogen-rich fertilizer to promote lush growth. Ensure consistent watering as temperatures rise.
Summer
During summer, monitor soil moisture closely, especially in hot weather. Mulching can help retain soil moisture and regulate temperature.
Fall
In fall, reduce watering as temperatures cool. Consider cutting back the plant to encourage healthy regrowth in spring.
Winter
In winter, protect Lucerne from frost by covering with mulch or fabric if necessary. Ensure it is not over-watered during dormancy.
Toxicity & Safety
Lucerne is generally non-toxic to pets and children. However, excessive consumption may lead to digestive upset. Always monitor pets around plants.
Good to know
How often should I water my Lucerne?
Water Lucerne deeply once a week, increasing to twice a week during dry periods. Ensure the soil remains moist but not waterlogged.
What type of soil is best for Lucerne?
Lucerne thrives in well-draining soil rich in organic matter, with a pH range of 6.0 to 7.5. Sandy loam or clay loam is ideal.
Can Lucerne grow in shade?
While Lucerne can tolerate partial shade, it thrives best in full sun, requiring at least 6-8 hours of direct sunlight daily for optimal growth.
What are the signs of nutrient deficiency in Lucerne?
Signs include yellowing leaves and stunted growth. Regular fertilization can help prevent these issues.
How do I propagate Lucerne?
Lucerne is best propagated through seeds. Sow seeds directly into the soil in early spring or fall, about 1/4 to 1/2 inch deep.
When should I repot my Lucerne?
Repot Lucerne every 2-3 years or when it becomes root-bound. Signs include roots growing out of drainage holes and stunted growth.
Is Lucerne safe for pets?
Lucerne is generally non-toxic to pets and children, but excessive consumption may lead to digestive upset. Monitor pets around the plant.
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