How to Grow Hydroponic Spinach: A Guide to Healthy Greens

When learning how to grow hydroponic spinach, a wealth of information is available online. But how do you know which tips to trust? We’re here to provide accurate guidance on growing spinach hydroponically, helping you achieve vibrant, nutrient-packed greens while ensuring a pathogen-free environment.

Growing Spinach Hydroponically

Hydroponic gardening might seem complex, especially for beginners, but with some time and patience, you’ll find it as straightforward as traditional methods. Spinach is an excellent choice for hydroponic growing due to its rapid growth and compact size. Here’s a step-by-step guide on how to grow spinach hydroponically:

  1. Choose the Right Variety: Opt for Noble Giant, Bloomsdale, New Zealand, America, or Matador Viking spinach. These are flavorful, heirloom plants that mature at different rates, giving you a steady supply of fresh greens.
  2. Select a Hydroponic System: Ebb and flow (flood and drain) and nutrient film technique (NFT) systems are great for beginners. Ebb and flow systems are easy to operate, while NFT systems are versatile and water-efficient.
  3. Start with Seeds or Clones: Use rapid rooter plugs to germinate seeds quickly. Alternatively, you can cold-stratify seeds by refrigerating them for up to three weeks before planting. Wait until the seedlings’ roots extend out of the germination medium before transferring them to the hydroponic system.
  4. Provide Adequate Lighting: Spinach requires 10-14 hours of light per day. You can use fluorescent or LED lighting, making sure not to expose plants to too much light, as it can hinder growth.
  5. Maintain Optimal Conditions: Keep the pH of your hydroponic solution around 5.5 to 6.5 and use a balanced fertilizer higher in nitrogen to encourage leafy growth. Ensure proper spacing (5-6 inches) between plants to allow for healthy growth.
  6. Harvesting: Spinach matures rapidly, typically ready for harvest in 30 to 45 days. Harvest the outer leaves first, avoiding removing more than a third of the plant at a time.

Preventing Pathogens in Hydroponic Spinach: Cleaning Tips

While hydroponic systems can reduce the risk of soil-borne pathogens, maintaining a clean environment is crucial for preventing waterborne pathogens. Here are some tips:

  1. Regular Cleaning: Clean and disinfect your hydroponic system regularly to prevent the buildup of algae, bacteria, and fungi.
  2. Proper Nutrient Solution: Ensure your nutrient solution is appropriately balanced to discourage pathogen growth. Monitor and adjust nutrient levels as needed.
  3. System Maintenance: Inspect and clean all system components, including pumps, pipes, and reservoirs, to prevent biofilm growth.
  4. Clean Hands and Tools: Practice good hygiene by washing hands thoroughly and disinfecting tools before touching your hydroponic system.

common microbes in food processing

The AirROS Solution: Enhanced Pathogen Prevention

To elevate your pathogen prevention measures in hydroponic farming, consider using the AirROS surface and air purification system. AirROS offers a two-phase process that effectively sanitizes the air and surfaces, ensuring a pathogen-free growing environment.

In the primary air cleaning, non-thermal plasma generates Reactive Oxygen Species (ROS) that destroy bacteria, viruses, molds, and other pathogens. The secondary phase diffuses sanitized air containing longer-lived ROS (H2O2 and O3), further purifying the environment.

Harnessing AirROS’s Dynamic Controller:

The AirROS dynamic controller, equipped with sensors, allows you to adjust the system’s sanitation power. You can monitor ROS levels on the digital display, ensuring optimal sanitation based on your farm’s activity and bio load.


Growing spinach hydroponically is an efficient way to enjoy nutrient-rich greens while minimizing the risk of soil-borne pathogens. By following the right techniques and incorporating tools like the AirROS system, you can ensure a bountiful harvest of fresh, healthy spinach. Embrace the power of hydroponic farming and innovative pathogen prevention methods to cultivate a thriving and sustainable growing environment.