How to Grow Hydroponic Spinach
A Complete Guide

Spinach is a nutrient-dense leafy green that thrives in hydroponic systems. Growing hydroponic spinach ensures faster growth, higher yields, and a continuous supply of fresh, pesticide-free greens year-round.
This guide will walk you through everything you need to know about cultivating hydroponic spinach successfully.
📌 Quick Overview: Growing Spinach Hydroponically
Factor | Details |
---|---|
Best Hydroponic Systems | NFT, DWC, Ebb & Flow, Kratky |
pH Level | 5.5 – 6.5 |
EC Range | 1.5 – 2.0 mS/cm |
PPM (Nutrient Strength) | 1050 – 1400 ppm |
Temperature | 60-75°F (15-24°C) |
Humidity | 50-70% |
Light Requirement | 10-14 hours per day |
Nutrient Needs | High nitrogen (N) for leaf growth, moderate phosphorus (P) and potassium (K) |
Growth Timeframe | 30-45 days |
Watering Needs | Consistent moisture, good aeration |
Harvest Time | When leaves reach full size, around 4-6 weeks |
Best Spinach Varieties for Hydroponics
Some spinach varieties adapt better to hydroponic conditions than others. Here are the top choices:
- Bloomsdale Spinach – A crinkled-leaf variety with high yield potential.
- Space Spinach – A fast-growing, disease-resistant hybrid.
- Tyee Spinach – Tolerant to temperature fluctuations, making it ideal for hydroponic systems.
- Viroflay Spinach – A broad-leaf variety with rich flavor and fast growth.
Step-by-Step Guide to Growing Hydroponic Spinach
1️⃣ Seed Selection & Germination
- Use high-quality, untreated spinach seeds for optimal germination.
- Pre-soak seeds in water for 6-12 hours to accelerate sprouting.
- Start seeds in Rockwool cubes, peat pellets, or net pots.
- Maintain a germination temperature of 65-75°F (18-24°C).
- Seeds typically sprout within 7-14 days.
2️⃣ Transplanting to Hydroponic System
- Once seedlings develop their first true leaves, transfer them to the hydroponic setup.
- Maintain pH levels between 5.5 – 6.5 to optimize nutrient uptake.
- Space plants 4-6 inches apart to allow proper leaf expansion.
3️⃣ Nutrient Requirements
- Use a nutrient-rich hydroponic solution with high nitrogen (N) and moderate phosphorus (P) and potassium (K).
- Maintain EC levels between 1.5 – 2.0 mS/cm.
- Change nutrient solution every 7-10 days.
- Supplement with calcium and magnesium to prevent leaf tip burn and deficiencies.
4️⃣ Lighting Conditions
- Provide 10-14 hours of light per day using full-spectrum LED grow lights.
- Position lights 12-18 inches above plants for uniform growth.
- If growing outdoors, ensure at least 6 hours of direct sunlight.
5️⃣ Harvesting & Maintenance
- Spinach is ready for harvest within 30-45 days.
- Use the cut-and-come-again method to extend yield.
- Remove older leaves to encourage new growth.
- Store harvested spinach at 32-40°F (0-4°C) for longer freshness.
💡 Best Hydroponic Systems for Spinach
Spinach thrives in various hydroponic systems that provide stable nutrient and water delivery.
🌱 Nutrient Film Technique (NFT)
✅ Best for: Continuous nutrient flow with minimal water use.
✅ How it works: A thin film of nutrient solution circulates over plant roots.
✅ Why choose it? Ideal for leafy greens like spinach.
🔗 Learn More
💧 Deep Water Culture (DWC)
✅ Best for: Home growers looking for a simple, high-yield system.
✅ How it works: Roots are submerged in an oxygenated nutrient solution.
✅ Why choose it? Encourages rapid leaf development and hydration.
🔗 Learn More
🚰 Ebb & Flow (Flood & Drain)
✅ Best for: Balanced root oxygenation and nutrient absorption.
✅ How it works: The grow tray is periodically flooded and drained.
✅ Why choose it? Prevents root rot and optimizes nutrient uptake.
🔗 Learn More
🌿 Kratky Method
✅ Best for: Passive, low-maintenance hydroponic growing.
✅ How it works: Plants grow in a static nutrient solution without pumps.
✅ Why choose it? Perfect for beginners.
🔗 Learn More
🚨 Common Issues & Solutions
Problem | Solution |
---|---|
Bolting (early flowering) | Keep temperatures below 75°F (24°C). Provide consistent moisture. |
Yellowing Leaves | Adjust pH levels and ensure adequate nitrogen. |
Root Rot | Improve aeration and prevent stagnant water. |
Slow Growth | Increase nitrogen levels and optimize light exposure. |
🔚 Final Thoughts
Hydroponic spinach is a rewarding crop that grows quickly with minimal maintenance. By selecting the right hydroponic system, maintaining proper nutrients, and optimizing environmental conditions, you can successfully cultivate fresh, nutrient-rich spinach year-round.
🚀 Start your hydroponic spinach garden today and enjoy fresh, homegrown greens!