Arugula seedlings

Fertilizing Arugula: Feeding Tips for Fast Growth

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Arugula is a fast-growing leafy green that thrives on rich soil and consistent nutrition. With my 30+ years of growing greens in raised beds and containers, I’ve learned that regular feeding is the key to lush, flavorful leaves. Fertilizing arugula correctly ensures rapid growth, steady leaf production, and a long harvest season. Here’s how to keep your arugula well-fed from seedling to harvest using natural, effective methods.


Why Fertilizing Matters for Arugula

Arugula grows quickly—often ready to harvest in just 30–40 days. This rapid growth demands a steady supply of nutrients, particularly nitrogen, to produce tender, peppery leaves. Without proper feeding, plants can become stunted, pale, or bitter.


Best Fertilizers for Arugula

  • Compost or Aged Manure: Enriches soil with slow-release nutrients and improves structure.
  • Balanced Organic Fertilizer (5-5-5 or 10-10-10): Provides nitrogen, phosphorus, and potassium for strong leaf and root development.
  • Fish Emulsion or Seaweed Extract: Gentle, fast-acting liquid feed to boost nitrogen and trace minerals during peak growth.

Feeding Schedule for Fast Growth

Growth StageFertilizer TypeApplication TipsFrequency
Pre-PlantingCompost or aged manureMix 2–3 inches into soil before sowingOnce
Seedling (2–3 inches tall)Fish emulsion or balanced liquid feedWater around the base of plantsEvery 10–14 days
Mid-Growth (4–6 inches tall)Balanced organic fertilizerLight side-dress around plantsEvery 3 weeks
Harvest PeriodFish emulsionLight foliar spray for quick uptakeEvery 10 days if leaves pale

Tips for Success

  • Avoid Overfeeding Nitrogen: Too much nitrogen produces lush leaves but reduces flavor and may encourage pests.
  • Water After Feeding: Always water thoroughly to help nutrients reach roots and prevent fertilizer burn.
  • Container Grown Arugula: Fertilize more frequently since nutrients leach out with watering—use liquid feed every 7–10 days.

My Experience

In my Sonoma Valley garden, arugula thrives when I start with rich compost and give a light liquid feeding every two weeks. This routine keeps leaves tender and peppery, even during fast spring growth. I’ve noticed that fish emulsion provides a quick boost, especially after frequent harvests.


Key Takeaways

  • Start with compost-rich soil for a strong foundation.
  • Feed lightly but consistently to keep growth steady.
  • Adjust fertilizing frequency based on container vs. garden bed planting.

With the right feeding plan, your arugula will reward you with abundant, flavorful harvests all season long.

Arugula Growing Hub

Start here: The Ultimate Arugula Growing Guide: From Seed to Harvest

Planting & Site Prep

Care & Maintenance

Pests & Diseases

Harvest & Storage

Varieties

Kitchen & Extra Uses

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