Growing Spinach in Hydroponics: A Fun and Easy Guide

Hey there, future spinach-growing superstar! Have you ever dreamed of having your own little garden, but without all the dirt and bugs? Well, guess what? Growing spinach in hydroponics means you can have fresh, yummy spinach right in your home! That's right—no soil, no mess, just delicious, leafy greens all year round.

Choosing the Right Hydroponic System

Before you start growing spinach hydroponically, you'll need to select a hydroponic system. There are several types to choose from, including nutrient film technique (NFT), deep water culture (DWC), and aeroponics. Each system has its own set of benefits, but for beginners, DWC is often the easiest and most cost-effective option.

Hydroponic Spinach Seeds

Not all spinach seeds are created equal. When choosing seeds for hydroponics, look for varieties known for their resistance to disease and their ability to thrive in a hydroponic environment. Some popular hydroponic spinach varieties include 'Bloomsdale,' 'Tyee,' 'Space,’ ‘Red Cardinal,’ and ‘Viroflay.’

Best Spinach Varieties to Grow Hydroponically

When it comes to growing spinach in hydroponics, choosing the right variety can make all the difference. Here, we explore some of the best spinach varieties for hydroponics, starting with the basics and diving into detailed descriptions. Let's take a look at Bloomsdale, Tyee, Space, and two additional varieties—Red Cardinal and Viroflay.

Bloomsdale Spinach

• Scientific Name: Spinacia oleracea
• Growth Time: 45-50 days
• Leaf Type: Savoy (crinkled)
• Flavor: Sweet and robust

Bloomsdale spinach is a classic choice for hydroponic gardening, known for its thick, crinkled leaves and robust flavor. This heirloom variety is prized for its high yield and resistance to bolting, making it a reliable option for consistent harvests.

• Growth and Care: Bloomsdale thrives in cool conditions, with an optimal temperature range of 60-70°F (15-21°C). It requires a well-balanced nutrient solution, rich in nitrogen, to support its leafy growth. Maintaining a pH level between 5.8 and 6.5 ensures optimal nutrient absorption.
• Advantages: This variety is particularly resistant to common spinach diseases such as downy mildew. Its thick leaves hold up well in salads and cooked dishes, offering versatility in the kitchen.
• Harvesting: Bloomsdale can be harvested as baby spinach or allowed to mature for larger leaves. Regular harvesting of outer leaves encourages continuous growth.

Tyee Spinach

• Scientific Name: Spinacia oleracea
• Growth Time: 37-45 days
• Leaf Type: Semi-savoy (slightly crinkled)
• Flavor: Mild and sweet

Tyee spinach is a favorite among hydroponic growers for its fast growth and resilience. This semi-savoy variety features slightly crinkled leaves that are tender and flavorful, making it ideal for both raw and cooked applications.

• Growth and Care: Tyee thrives in temperatures between 60-75°F (15-24°C) and can tolerate slightly warmer conditions than other varieties. It requires a nutrient solution balanced in nitrogen, phosphorus, and potassium, and a pH level of 5.8-6.5.
• Advantages: Known for its disease resistance, Tyee is particularly resistant to downy mildew. Its rapid growth cycle makes it perfect for quick turnover in hydroponic systems.
• Harvesting: Tyee can be harvested as baby spinach within 37 days, with full maturity reached by 45 days. Regularly picking the outer leaves promotes continued growth.

Space Spinach

• Scientific Name: Spinacia oleracea
• Growth Time: 39-45 days
• Leaf Type: Smooth
• Flavor: Mild and slightly sweet

Space spinach is a smooth-leaf variety that is well-suited for hydroponic systems. It is known for its fast growth, uniform leaf shape, and mild flavor, making it a popular choice for salads and smoothies.

• Growth and Care: Space spinach prefers cooler temperatures, ideally between 60-70°F (15-21°C). It grows well in a nutrient solution rich in nitrogen, with a pH range of 5.8-6.5.
• Advantages: This variety is resistant to downy mildew and other common diseases. Its smooth leaves make it easy to clean and prepare, providing a crisp texture in fresh dishes.
• Harvesting: Space spinach can be harvested as baby greens or allowed to mature. The uniform growth makes harvesting straightforward, ensuring a consistent supply of fresh leaves.

Red Cardinal Spinach

• Scientific Name: Spinacia oleracea
• Growth Time: 45-50 days
• Leaf Type: Savoy (crinkled)
• Flavor: Earthy and robust

Red Cardinal spinach is a striking variety known for its deep red stems and dark green, crinkled leaves. It adds a splash of color to any dish and is packed with nutrients.

• Growth and Care: This variety prefers temperatures between 60-70°F (15-21°C) and thrives in a well-balanced nutrient solution. Keeping the pH level between 5.8 and 6.5 ensures healthy growth.
• Advantages: Red Cardinal is not only visually appealing but also rich in antioxidants. It is moderately resistant to downy mildew and other diseases.
• Harvesting: The vibrant leaves can be harvested as baby greens or left to mature. Regular harvesting of outer leaves will encourage new growth.

Viroflay Spinach

• Scientific Name: Spinacia oleracea
• Growth Time: 40-50 days
• Leaf Type: Smooth
• Flavor: Mild and sweet

Viroflay spinach, also known as "Monstrueux de Viroflay," is an old French heirloom variety. It is famous for its large, smooth leaves and sweet, mild flavor.

• Growth and Care: Viroflay prefers cooler growing conditions, ideally between 60-70°F (15-21°C). A nutrient solution high in nitrogen and maintaining a pH of 5.8-6.5 will support its vigorous growth.
• Advantages: This variety is known for its rapid growth and large leaves, which can grow up to 10 inches in length. It is also resistant to bolting, making it suitable for extended harvests.
• Harvesting: Viroflay can be harvested as baby spinach or allowed to grow to its full size. Its large leaves are perfect for cooking and salads.

Hydroponic Spinach Germination

Germinating spinach seeds in hydroponics is a straightforward process. Start by soaking your seeds in water for 24 hours to soften the seed coat. Then, place them in a growing medium like rockwool cubes or coco coir. Keep the seeds moist and at a temperature of around 70°F until they sprout. This usually takes about 5-10 days.

Transferring Seedlings to the Hydroponic System

Once your spinach seedlings have developed a few true leaves, it’s time to transfer them to your hydroponic system. Be gentle during this process to avoid damaging the delicate roots.

Place each seedling into its own net pot filled with a growing medium, and then position the pots in your hydroponic setup.

Nutrient Solution for Hydroponic Spinach

One of the most critical components of growing spinach in hydroponics is the nutrient solution. Spinach requires a balanced nutrient mix with adequate levels of nitrogen, phosphorus, and potassium. You can purchase pre-mixed hydroponic nutrient solutions or mix your own. Be sure to follow the instructions carefully to avoid over or under-fertilizing your plants.

Best Water Quality for Hydroponic Spinach

Water quality is a cornerstone of successful hydroponic gardening. Here’s what you need to know:

1. Clean Water: Start with clean, filtered water. Tap water often contains chlorine and other chemicals that can harm your plants.
2. Nutrient Balance: Ensure your water has the right balance of nutrients. Too much or too little can stunt growth or damage your plants.
3. pH Levels: Regularly test and adjust the pH of your water. Spinach needs slightly acidic water with a pH between 5.8 and 6.5.
4. Oxygenation: Oxygen is vital for root health. Using an air stone or pump can keep the water oxygenated, promoting healthy root development.
5. Temperature: Keep your water temperature between 65-70°F (18-21°C). Water that's too hot or cold can stress your plants.

How Much Light for Hydroponic Spinach?

Light is essential for the growth of your hydroponic spinach. Spinach needs about 12-14 hours of light per day to thrive. LED grow lights are a popular choice for indoor hydroponic gardens because they are energy-efficient and provide the full spectrum of light that plants need.

Managing pH and Temperature

Maintaining the right pH and temperature is crucial for the health of your hydroponic spinach. The ideal pH range for spinach is between 5.8 and 6.2. Regularly check the pH of your nutrient solution and adjust it as necessary. The optimal temperature for growing spinach is between 65°F and 75°F. Keeping your growing environment within these parameters will help ensure a healthy and productive crop.

Hydroponic Spinach Growing Tips

Hydroponic spinach can be a delightful addition to your indoor garden. Here are some top tips to ensure your spinach thrives:

1. Choose the Right System: There are several hydroponic systems to choose from, such as Nutrient Film Technique (NFT), Deep Water Culture (DWC), and Aeroponics. For spinach, NFT and DWC systems work particularly well.
2. Light Matters: Spinach needs plenty of light to grow. If you're growing indoors, using LED grow lights can mimic the sun and help your plants flourish. Aim for 12-14 hours of light daily.
3. Optimal Temperature: Spinach prefers cooler temperatures. Keep your growing area between 60-70°F (15-21°C) to ensure the best growth.
4. Nutrient Solution: Use a balanced nutrient solution specifically designed for leafy greens. Spinach loves nutrients rich in nitrogen to support its leafy growth.
5. pH Levels: Maintaining the right pH level is crucial. Spinach grows best in slightly acidic conditions with a pH between 5.8 and 6.5.
6. Spacing and Airflow: Make sure your spinach plants have enough space to grow and breathe. Good airflow helps prevent mold and mildew.
7. Regular Maintenance: Keep an eye on your plants daily. Check for signs of nutrient deficiencies, pests, or diseases and take action promptly.

Why Are My Hydroponic Spinach Leaves Curling?

Curling leaves can be a sign of several issues, including nutrient deficiencies, pests, or environmental stress. Check your nutrient solution to ensure it has the right balance of nutrients. Inspect your plants for signs of pests such as aphids or spider mites. Lastly, make sure your growing environment is not too hot, too cold, or too dry.

Why Is My Hydroponic Spinach Dying?

Seeing your spinach struggle can be disheartening. Here are common reasons why hydroponic spinach may die and how to fix them:

• Nutrient Imbalance: Too much or too little nutrients can harm your plants. Ensure you're using the right nutrient mix and concentrations.
• Poor Water Quality: Contaminated or improperly balanced water can lead to plant stress. Use clean, filtered water and maintain proper pH levels.
• Inadequate Light: Spinach needs ample light. If growing indoors, ensure your plants receive 12-14 hours of light daily.
• Temperature Fluctuations: Spinach prefers cooler temperatures. Keep your growing area within the ideal range of 60-70°F (15-21°C).
• Disease and Pests: Inspect your plants regularly for signs of disease or pests. Early detection and treatment are crucial.
• Root Issues: Ensure the roots are healthy and well-oxygenated. Root rot can occur in poorly oxygenated water.

What Causes Hydroponic Spinach to Yellow?

Yellowing leaves in hydroponic spinach can signal several issues:

• Nutrient Deficiency: A lack of essential nutrients, especially nitrogen, can cause yellowing. Ensure your nutrient solution is balanced and suitable for leafy greens.
• pH Imbalance: Improper pH levels can hinder nutrient absorption, leading to yellowing leaves. Maintain a pH between 5.8 and 6.5.
• Water Quality: Poor water quality can lead to nutrient deficiencies and yellowing. Use clean, filtered water and regularly check nutrient levels.
• Pests and Diseases: Pests like aphids or diseases can cause yellowing. Regularly inspect your plants and address any issues promptly.
• Overwatering or Underwatering: Both over and underwatering can stress your plants, leading to yellowing leaves. Ensure proper watering techniques and well-oxygenated water.

Harvesting Hydroponic Spinach

Spinach grown hydroponically typically reaches maturity in about 30-40 days. You'll know it's time to harvest when the leaves are large enough to use. The beauty of hydroponic spinach is that you can harvest the outer leaves as you need them, allowing the plant to continue producing new growth.

Hydroponic Spinach Yield per Plant

The yield of hydroponic spinach can vary depending on the variety and growing conditions. On average, you can expect to harvest about 2-4 ounces of spinach per plant. With proper care and optimal conditions, some growers report even higher yields.

How to Store Hydroponic Spinach

Harvesting fresh spinach is exciting, but knowing how to store it properly ensures you enjoy it for longer:

Harvest Time: Harvest your spinach in the morning when it's most hydrated.

Immediate Cooling: After harvesting, rinse the leaves with cold water to remove any nutrient residue and cool them down.

Dry Thoroughly: Use a salad spinner or pat the leaves dry with a clean towel.

Storage Methods: 

• Refrigerator: Store your spinach in a plastic bag or airtight container in the refrigerator. Adding a paper towel inside can absorb excess moisture and keep the leaves fresh.
• Freezing: Blanch the spinach leaves in boiling water for 2 minutes, then quickly transfer them to ice water. Pat dry and store in freezer bags for long-term storage.

Growing Spinach Indoors in Hydroponics

Growing spinach indoors allows you to control the environment and extend your growing season. Make sure your plants get enough light and nutrients, and monitor the pH and temperature regularly. With a little care and attention, you can enjoy fresh spinach year-round.

Hydroponic Spinach Nutrient Solution Tips

Using the right nutrient solution is key to growing healthy hydroponic spinach. Look for a solution specifically formulated for leafy greens, and follow the mixing instructions carefully. Regularly check the nutrient levels and adjust as needed to ensure your plants are getting the nutrients they need to thrive.

FAQ

Does Spinach Do Well in Hydroponics?

Absolutely! Spinach is a fantastic crop for hydroponic systems. It thrives in the controlled environment that hydroponics provides, where you can optimize light, temperature, and nutrient levels to create ideal growing conditions. Plus, growing spinach indoors means you can enjoy fresh greens even in the dead of winter.

How Long to Grow Spinach Hydroponically?

Spinach grown hydroponically typically reaches maturity in about 30-40 days.

Does Hydroponic Spinach Regrow After Cutting?

Yes, spinach can regrow after harvesting. Cut the outer leaves first, allowing the center to continue growing for multiple harvests.

What Is the Best Spinach to Grow Hydroponically?

Varieties like Bloomsdale, Regiment, and Tyee are excellent choices for hydroponic growing due to their robust growth and disease resistance.

Is Spinach Easy to Grow in Hydroponics?

With the right setup and care, spinach is relatively easy to grow hydroponically. It's a rewarding plant for both beginners and experienced gardeners.

Is Hydroponic Spinach Healthy?

Yes, hydroponic spinach is healthy and packed with nutrients. Growing it hydroponically can even enhance its nutritional profile by controlling nutrient intake.

Does Hydroponic Spinach Need to Be Washed?

While hydroponic spinach is grown in a clean environment, it's still a good idea to wash it before consumption to remove any nutrient residues or dust.

Final Thoughts

Growing spinach in hydroponics is a rewarding and efficient way to enjoy fresh, homegrown greens. By following these tips and maintaining optimal growing conditions, you can achieve a bountiful harvest. Whether you're a seasoned gardener or a beginner, hydroponic spinach is a great addition to your indoor garden.

For more information on hydroponic gardening and to deepen your knowledge, check out these helpful resources:

1. Hydroponics for Beginners: Learn How to Grow Plants Without Soil
2. How to Start a Hydroponic Garden: 5 Methods
3. Understanding Nutrients in Hydroponics

Ready to start your hydroponic spinach journey? Grab your seeds, set up your system, and watch your garden grow! 

Feel free to reach out with any questions or tips. Happy gardening!