Fertilizing Arugula: Feeding Tips for Fast Growth

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.

Table of Contents

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 Stage	Fertilizer Type	Application Tips	Frequency
Pre-Planting	Compost or aged manure	Mix 2–3 inches into soil before sowing	Once
Seedling (2–3 inches tall)	Fish emulsion or balanced liquid feed	Water around the base of plants	Every 10–14 days
Mid-Growth (4–6 inches tall)	Balanced organic fertilizer	Light side-dress around plants	Every 3 weeks
Harvest Period	Fish emulsion	Light foliar spray for quick uptake	Every 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.