Arugula
Eruca Vesicaria
Eruca vesicaria, commonly known as arugula, is a fast-growing leafy green prized for its peppery flavor. Originating from the Mediterranean, it is easy to grow and adds a nutritious touch to salads and dishes.
Everything it needs
9 essentials at a glance
Watering
Eruca vesicaria, commonly known as arugula, prefers consistently moist soil but should not be waterlogged.
Water the plant deeply once a week, increasing frequency during hot weather or if the soil dries out quickly. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause wilting and leaf drop.
Light
Arugula thrives in full sun but can tolerate partial shade, especially in hotter climates.
Ideally, it should receive 6-8 hours of sunlight daily. In regions with intense heat, some afternoon shade can help prevent bolting.
Soil
This plant prefers well-draining soil rich in organic matter with a pH range of 6.0 to 7.0.
A recommended potting mix includes equal parts of compost, peat moss, and perlite to ensure good drainage and nutrient availability.
Humidity
Arugula prefers moderate humidity levels, ideally between 40-60%.
To increase humidity, mist the leaves or place a humidity tray filled with water nearby. Signs of low humidity stress include crispy leaf edges and slow growth.
Temperature
The ideal temperature range for arugula is between 45-75°F (7-24°C).
It is a cool-season crop, thriving in USDA hardiness zones 3-10. It can tolerate light frost but may bolt in temperatures above 75°F (24°C).
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10 or similar.
Fertilize every 4-6 weeks during the growing season, especially if the soil is low in nutrients. Signs of nutrient deficiency include yellowing leaves and stunted growth.
Pruning
Pruning is not typically necessary for arugula, but you can remove any yellow or damaged leaves to promote healthy growth.
Regularly harvesting the outer leaves encourages bushier growth and prevents bolting.
Repotting
If growing in containers, repot arugula when it outgrows its pot or if the soil becomes compacted.
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 refresh the soil when repotting.
Propagation
Arugula is typically propagated by seeds.
Sow seeds directly in the garden or in pots about 1/4 inch deep, spaced 1 inch apart. Best timing for sowing is in early spring or late summer for a fall harvest. Thin seedlings to 6 inches apart once they are a few inches tall.
When it's unhappy
Bolting
Why it happens
Bolting occurs when the plant flowers prematurely due to stress from heat or lack of water.
How to fix it
To prevent bolting, ensure consistent watering and provide some shade during hot weather.
Pests (e.g., aphids)
Why it happens
Aphids can infest arugula, especially in warm weather, sucking sap from the leaves.
How to fix it
Control aphids by using insecticidal soap or introducing beneficial insects like ladybugs.
Downy mildew
Why it happens
This fungal disease thrives in humid conditions and can cause yellow spots on leaves.
How to fix it
Improve air circulation, avoid overhead watering, and remove affected leaves to prevent spread.
Leaf spot
Why it happens
Leaf spot diseases can occur due to excess moisture or poor air circulation.
How to fix it
Ensure proper spacing between plants and avoid watering the leaves to minimize the risk.
Yellow leaves
Why it happens
Yellowing leaves can indicate nutrient deficiencies, particularly nitrogen.
How to fix it
Apply a balanced fertilizer to replenish nutrients and ensure healthy growth.
Care through the year
Spring
In spring, sow arugula seeds directly in the garden as soon as the soil can be worked. Keep the soil moist and thin seedlings as they grow.
Summer
In summer, provide some afternoon shade to prevent bolting. Water regularly to keep the soil moist, especially during heat waves.
Fall
In fall, consider sowing a second crop of arugula for a late harvest. Protect young plants from frost with row covers if necessary.
Winter
In winter, arugula can be grown indoors in containers under grow lights. Ensure they receive adequate light and moisture.
Toxicity & Safety
Arugula is considered non-toxic to pets and children. It is safe to consume and poses no known health risks when eaten in normal dietary amounts.
Good to know
How often should I water my arugula?
Water arugula deeply once a week, adjusting for hot weather. Ensure the soil remains consistently moist but not soggy.
Why are my arugula leaves turning yellow?
Yellow leaves may indicate nutrient deficiencies, particularly nitrogen, or over-watering. Check your watering schedule and consider fertilizing.
What is the best temperature for growing arugula?
Arugula grows best in temperatures between 45-75°F (7-24°C). It is a cool-season crop that can tolerate light frost.
How can I prevent arugula from bolting?
To prevent bolting, keep the soil consistently moist and provide shade during hot weather. Harvest regularly to encourage growth.
Can I grow arugula in containers?
Yes, arugula grows well in containers. Use a pot with good drainage and ensure it receives enough sunlight.
How long does it take for arugula to mature?
Arugula typically matures in about 40-50 days from seed to harvest, depending on the growing conditions.
What are good companion plants for arugula?
Good companion plants for arugula include radishes, carrots, and beans, which can help deter pests and improve growth.
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