Growing Baby Greens Hydroponically: A Tower Garden Growing Guide
If you love fresh salads, baby greens are one of the easiest ways to keep something growing in your Tower Garden. They're quick to harvest, don't take up much room, and you can grow several different varieties together.
Baby greens are simply young, tender leaves harvested before the plants reach their full size. You can grow them in the dedicated Baby Greens growing ports, but you don't need a special extension to get started. Regular Tower Garden growing ports work too.
There's one important difference between growing baby greens and starting most other vegetables: how you plant and water the seeds. We use around 20 or more seeds per rockwool cube, spread across the surface rather than planted down in the hole.
Here's how we grow baby greens at Living Towers, from starting seeds to harvesting and enjoying them.
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Baby Greens Quick Facts
Baby greens are a great choice for growers who want relatively quick harvests without waiting for full-sized vegetables to develop.
Because you're harvesting the leaves while they're young, you don't need to worry about flowering, pollination or supporting heavy plants.
What Baby Greens Can You Grow Hydroponically?
One of the fun things about baby greens is experimenting with different flavors and textures. Some are mild, some are peppery, and others bring a little color to your salads.
At Living Towers, we grow and sell several varieties of baby green seedlings:
- Arugula: A peppery green that adds plenty of flavor to salads and sandwiches.
- Broccoli Mix: Tender young greens with a mild brassica flavor.
- Spicy Mix: A blend for anyone who likes a little extra kick in their salads.
- Dandelion: Young leaves with a distinctive, slightly bitter flavor.
- Kale: Tender young kale leaves that work well in salads, smoothies and wraps.
- Beets: Colorful young leaves with an earthy flavor.
Other crops, including lettuce, spinach, Swiss chard and mustard greens, can also be harvested young. You don't have to limit yourself to varieties specifically labeled as baby greens.
Want to skip the seed-starting stage? Browse our Baby Green Seedlings and start with plants that are already growing.
How to Start Baby Greens from Seed
Starting baby greens is a little different from starting tomatoes, peppers, lettuce or most other crops in rockwool.
Instead of planting one or two seeds down in the hole, you're creating a small cluster of young plants that will grow together.
1. Prepare Your Rockwool
Soak the rockwool cubes in water for approximately 20 minutes, then place them in a shallow tray or baking dish.
The rockwool should be thoroughly moistened before you add the seeds.
2. Spread the Seeds Across the Surface
We generally use around 20 or more seeds per rockwool cube, depending on the crop.
Spread the seeds across the top surface of the rockwool rather than dropping them all into the planting hole.
If you prefer, you can fill the hole with a small spare piece of rockwool to create a more even planting surface.
3. Water from Below
This is probably the most important part of starting baby greens.
🌱 Don't water newly seeded baby greens from above!
Because the seeds are sitting on top of the rockwool, pouring water over them can wash the seeds right off the cube.
Instead, add plain water to the tray and allow the rockwool to absorb it from below. Continue bottom watering until the roots have grown through the rockwool.
Keep the cubes moist, but don't leave them sitting in excessive water. Too much moisture can cause problems with seedling development.
4. Move the Seedlings into Your Tower Garden
Baby greens are often ready to move into the Tower Garden after approximately one week, depending on the variety and growing conditions.
Look for healthy young growth and roots developing through the rockwool rather than relying only on the number of days.
Once established, the plants can receive water through the Tower Garden system.
Where Should Baby Greens Go in a Tower Garden?
Baby greens can be grown in either the Baby Greens growing ports or regular Tower Garden growing ports.
The Baby Greens Extension and Combo Extension are useful if you want to grow more greens in the same amount of vertical space, but they aren't required.
We generally position baby greens toward the upper part of the tower, where they can receive plenty of light without being shaded by larger crops.
Because they're harvested young, they don't need the same amount of space as full-sized kale, Swiss chard or other mature leafy greens.
If you're growing several different crops in one Tower Garden, consider how large the neighboring plants will become.
Light and Temperature for Baby Greens
Growing Baby Greens Outdoors
Outdoors, aim for at least 5 hours of direct sunlight, while keeping the needs of your specific varieties in mind.
Baby greens don't all have identical temperature preferences. Some crops handle warmer conditions better than others.
For example, kale and arugula generally prefer cooler conditions, while other leafy crops may be more adaptable.
If you're growing outdoors in a hot climate, choose your varieties with the season in mind.
Growing Baby Greens Indoors
Baby greens are also a great option for indoor Tower Gardens.
With Tower Garden LED grow lights, provide approximately 14–16 hours of light per day, followed by complete darkness overnight.
We generally begin with the lights approximately 6–8 inches above the tops of the plants and adjust them as the plants grow.
Good airflow helps keep the growing environment healthy, particularly when many young plants are growing closely together.
Learn more in our Tower Garden Light Guide.
Water, pH and Nutrients
Once baby greens are established in the Tower Garden, they can grow using the same Mineral Blend nutrients as your other crops.
For established plants, our standard Tower Garden nutrient rate is 20 mL Mineral Blend A and 20 mL Mineral Blend B per gallon of water.
For young seedlings, we generally start at approximately half strength: 10 mL of A and 10 mL of B per gallon.
Maintain the nutrient solution at approximately pH 5.5–6.5.
Remember that during the initial seed-starting stage, the priority is keeping the rockwool moist without washing the surface-sown seeds away.
For more detailed instructions, visit our Water Guide and Nutrients Guide.
Common Problems When Growing Baby Greens
Seeds Washing Off the Rockwool
This is one of the easiest mistakes to make when starting baby greens.
Because the seeds are spread across the surface, watering from above can wash them away before they have a chance to establish roots.
Bottom water the rockwool cubes until the roots grow through them.
Seedlings Staying Too Wet
Rockwool should stay moist during germination, but excessive water can create problems.
Avoid leaving the cubes submerged in standing water for extended periods.
Uneven Germination
Some varieties germinate faster than others, particularly when you're growing a mix of seeds.
Give the seedlings time to establish and remember that temperature, moisture and seed quality all affect germination.
Leggy or Weak Growth
If the seedlings become tall, thin and weak, check whether they're receiving enough light.
Young plants need sufficient light to develop strong, healthy growth.
Pests
Check leaves regularly for signs of insects or feeding damage. Because baby greens grow closely together, it's helpful to catch problems early.
Visit our Pests & Diseases Guide for help identifying common problems.
How to Harvest Baby Greens
Baby greens are generally ready to harvest in approximately 2–4 weeks, depending on the variety and growing conditions.
You have two main options when harvesting.
Cut-and-Come-Again Harvesting
Use clean scissors to cut the leaves approximately an inch above the base, leaving enough healthy growth for the plants to potentially produce another harvest.
Regrowth depends on the crop and how much of the growing point remains intact.
Harvesting the Entire Crop
If you want a larger batch of greens at once, you can cut the entire planting when it's ready.
This is particularly useful when you're planning to replant the growing port with another crop.
🌿 Keep harvesting: If you're using the cut-and-come-again method, leave enough healthy growth for the plants to recover. Some varieties will produce additional harvests, although regrowth varies by crop.
Storing and Using Your Baby Greens
One of the best things about growing baby greens at home is harvesting them right before you need them.
Freshly harvested baby greens are wonderful in salads, sandwiches, wraps and smoothies. You can also add them to soups or stir-fries just before serving.
How to Store Baby Greens
If you're not eating them immediately, keep harvested greens refrigerated.
- Remove damaged or unhealthy leaves.
- Rinse when ready to use, or wash and dry thoroughly before storing.
- Store in a covered container with a paper towel to help manage moisture.
- For the best quality, aim to use them within approximately 5–7 days.
Easy Ways to Enjoy Baby Greens
- Salads: Mix mild and peppery greens for different flavors.
- Sandwiches and wraps: Add a handful of freshly harvested leaves.
- Smoothies: Blend tender greens with fruit and yogurt.
- Soups and stir-fries: Add greens near the end of cooking.
- Garnishes: Use colorful baby greens to finish a dish.
Simple Baby Greens Salad
Here's an easy way to enjoy your harvest.
Ingredients:
- 2 cups mixed baby greens
- 1/4 cup sliced almonds
- 1/2 cup cherry tomatoes, halved
- 1/4 cup crumbled feta cheese
- 2 tablespoons olive oil
- 1 tablespoon balsamic vinegar
- Salt and pepper to taste
Instructions:
- Combine the baby greens, almonds, tomatoes and feta in a bowl.
- Drizzle with olive oil and balsamic vinegar.
- Season with salt and pepper, toss gently and serve.
Are Baby Greens Good for Hydroponic Growing?
Absolutely. Baby greens are a great choice for Tower Garden growers who want fresh food without waiting for full-sized crops to mature.
They don't require pollination or plant supports, and they can be grown in regular Tower Garden ports or the dedicated Baby Greens growing sections.
Once you understand how to start the seeds on the rockwool surface and water them from below, they're a relatively simple crop to grow.
You can start your own seeds or save time with our Baby Green Seedlings.
Looking for more ideas? Explore our Hydroponic Crop Library to discover more leafy greens, herbs and vegetables you can grow hydroponically.
Continue Learning
Seeds & Seedlings
Learn how to start seeds and get healthy seedlings established.
Explore Seeds & Seedlings →Water
Learn about water quality, reservoir care and maintaining your system.
Explore the Water Guide →Pests & Diseases
Identify common growing problems and learn what to check.
Explore Pests & Diseases →Crop Library
Explore more hydroponic growing guides and choose your next crop.
Explore the Crop Library →
