Hydroponic arugula is one of the fastest, easiest greens you can grow at home. If you’re just getting started with hydroponics, arugula is a perfect entry point—it grows quickly, takes up very little space, and doesn’t demand much attention.
We have an NFT system dedicated to growing arugula for our bearded dragons. Here’s how to grow it yourself
🥬 Quick How-To: Hydroponic Arugula from Seed to Salad
- Start 2–3 seeds per grow plug (Rapid Rooters or rockwool)
- Keep temps around 60–70°F and plugs moist (not soaked)
- Transplant once seedlings reach 2–3 inches tall
- Maintain pH 5.5–6.5 and light feeding (EC 0.8–1.2)
- Provide 10–14 hours of light daily
- Harvest outer leaves in 2–3 weeks
👉 That’s the whole process—simple, fast, and beginner-friendly.
Why Arugula Is Perfect for Hydroponics
- Fast growth (ready in 3–5 weeks)
- Compact plants (great for small systems)
- Cut-and-come-again harvesting
- More flavor than store-bought greens
Arugula is slightly more sensitive to heat than lettuce, but otherwise just as easy—if not easier—to grow.
Germinating Arugula Seeds
Starting arugula seeds is simple, and they sprout fast.
- Place 2–3 seeds per plug
- Keep plugs moist, not soaked. A little airflow goes a long way
- Maintain temps around 60–70°F
- Germination usually happens in 2–4 days
- Thin to the strongest seedling (pinch extras, don’t pull)
Once the roots start to grow out of the bottom of the plugs, they are ready to be transferred into your hydroponic system.
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Best Hydroponic Systems for Arugula
Arugula grows well in nearly any hydroponic setup.
- Kratky Method: Easiest if growing a small amount, no electricity/pumps
- NFT (Nutrient Film Technique): Efficient and scalable
- Deep Water Culture (DWC): Faster growth, bigger yields
- Ebb & Flow: Great balance of simplicity and performance
Best starting point: If you want to grow several plants, I recommend an NFT system.
Check out my review of the Vivosun hydroponic NFT System.
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Temperature Needs
Arugula prefers cooler conditions.
- Ideal range: 55–70°F
⚠️ Watch Out:
Above 75°F, arugula becomes noticeably more bitter and spicy.
Spacing Requirements
Arugula
- Baby greens: 4–6 inches apart
- Mature plants: 6–8 inches apart
Arugula doesn’t form large heads like lettuce, so you can grow it a bit more tightly.
Light Requirements
Like most leafy greens, arugula is not very demanding when it comes to light.
- Provide 10–14 hours per day
Lighting options:
- LED grow lights (most efficient)
- Fluorescent (budget-friendly)
What height you keep the light above the plants depends on the lights intesity.
Quick diagnosis:
- Tall, weak plants → need more light/ move light closer
- Too short/compact→ light too close
- Crispy edges → too much heat or light
Optimal pH for Hydroponic Arugula
Keep your nutrient solution between:
- pH 5.5–6.5
If your pH falls outside of this range, the plant can’t absorb nutrients efficiently.
Related: How to correct the pH of your hydroponic nutrient solution
Nutrients for Hydroponic Arugula
Arugula is a leafy green, so it thrives with mild, nitrogen-focused nutrients.
- Use a nutrient blend for leafy greens
- Keep feeding light: EC 0.8–1.2
For beginners, I recommend using SuperThrive Foliage Pro hydroponic nutrients. It’s a super simple one-part nutrient regimen
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💡 Pro Tip:
Overfeeding won’t grow arugula faster—it just makes the flavor harsher.
Related: 4 Top Hydroponic Nutrients For Beginners
How Long Does It Take Arugula to Grow?
- Germination: 2–4 days
- Baby greens: 2–3 weeks
- Full harvest: 3–5 weeks
For best results, harvest early and often. This will promote the plant to grow more.
Harvesting Arugula (Cut-and-Come-Again)
👉 This is a game-changer. Harvesting this way keeps plants producing for weeks instead of just one harvest.
- Trim outer leaves first
- Leave the center intact
- Harvest every few days once mature
Common Problems When Growing Hydroponic Arugula
🌶️ Arugula Is Too Spicy or Bitter
- Cause: Heat or waiting too long to harvest
- Fix: Lower temps and harvest earlier
🟡 Yellow Leaves
- Cause: pH imbalance or weak nutrients
- Fix: Check pH first, then adjust feeding
🌱 Slow Growth
- Cause: Low light or low nutrients
- Fix: Increase light duration or slightly increase feeding
Mold on Seedlings
- Cause: Too much moisture, poor airflow
- Fix: Let plugs breathe and avoid overwatering
Quick FAQ
How long does hydroponic arugula take to grow?
Baby greens are ready in about 2–3 weeks, with full harvests in 3–5 weeks.
What’s the best hydroponic system for arugula?
Kratky is easiest for beginners, while DWC and NFT provide faster growth.
What is the ideal pH for hydroponic arugula?
Keep your nutrient solution between 5.5 and 6.5.
How much light does arugula need?
Around 10–14 hours per day with moderate intensity.
Final Thoughts
Growing hydroponic arugula is one of the fastest ways to get fresh food from your system without a steep learning curve.
Keep it cool, don’t overfeed it, and harvest early—you’ll have flavorful greens in just a few weeks.
👉 If you’re new to hydroponics, this is one of the easiest crops to start with—and one of the most rewarding.
