Growing Peas Hydroponically: A Complete Tower Garden Guide
Peas are a great cool-season crop for hydroponic growing. They grow quickly once established, produce edible pods or peas depending on the variety, and can be grown outdoors or indoors with adequate light.
The biggest difference between peas and many of the other fruiting crops you might grow in a Tower Garden is temperature. While tomatoes, peppers, cucumbers and beans generally prefer warmer conditions, peas prefer it cooler. That makes them particularly useful for fall, winter and spring growing.
🫛 Planning a cool-season Tower? Peas can be a great way to add a producing crop alongside cool-season greens and herbs. Just remember that the vines need somewhere to climb.
Pea Growing Guide
Choosing Peas for Hydroponic Growing
Peas come in several types, including shelling peas, snow peas and sugar snap peas. All can be grown hydroponically, but their pods are harvested and eaten differently.
Sugar Snap Peas
Sugar snap peas produce sweet, crisp pods that are eaten whole. They're a great choice when you want a crop you can pick directly from the plant and eat pod and all.
At Living Towers, we offer Sugar Snap Pea seedlings ready for hydroponic growing.
Sugar Daddy Sugar Snap Peas
Sugar Daddy is the sugar snap pea variety we offer as seed. Starting your own peas from seed gives you the opportunity to grow the plants from the beginning right in rockwool.
Whichever pea you choose, plan for the mature plant rather than the tiny seedling. Peas naturally want to climb as they grow.
Starting Peas From Seed
We normally plant 2 pea seeds per rockwool cube.
Pea seeds are fairly large, but one of the biggest mistakes when starting them in rockwool is giving them too much water.
🌱 Don't drown your pea seeds: Pea seeds have a tendency to rot when they're kept too wet. Keep the rockwool moist enough that the cube doesn't dry out, but don't let the cube sit or “swim” in excess water while the seeds are germinating.
The goal isn't to dry the rockwool out. It's to maintain enough moisture for germination without completely saturating the cube with excess water.
Once the seedlings emerge, give them good light so they develop strong growth rather than stretching toward a light source.
If you'd rather skip germination, you can start with hydroponic-ready Sugar Snap Pea seedlings.
For more information about starting plants in rockwool, see our How Many Seeds Should I Plant? article and Seeds & Seedlings Guide.
Where Should Peas Go in a Tower Garden?
Think about two things when choosing a planting location for peas: light and support.
The small seedling you put into the Tower won't stay small for long. As the vines grow, they'll need somewhere to climb without becoming tangled through neighboring plants.
Position peas where you can easily direct their growth toward a trellis, cage or other support. Avoid planting them where the mature vines will block light from smaller plants or become wrapped around equipment.
Plan before you plant. It's much easier to guide young pea vines onto support than to untangle a mature plant after it has already decided where it wants to grow.
How Much Light Do Peas Need?
Peas need good light for healthy growth and pod production.
Outdoors, place the Tower where the plants receive plenty of light. In warmer climates, seasonal conditions matter too — peas prefer cooler weather, so the hottest location isn't necessarily the best one.
Indoors, provide approximately 14–16 hours of grow light per day, followed by complete darkness overnight.
With Tower Garden grow lights, keep the lights approximately 6–8 inches from the tops of the plants as they grow. Because pea vines can grow beyond the neat footprint of the Tower, you may need to pay attention to whether the climbing growth is still receiving adequate light.
See our Tower Garden Light Guide for more information.
What Temperature Do Peas Like?
Peas are a cool-season crop. This is one of the most important things to understand before adding them to your Tower.
They're generally much happier during cooler parts of the year than during intense summer heat. As temperatures climb, pea plants can become stressed and production can decline.
In warm climates such as Florida, that makes peas much better suited to the cooler growing season than the middle of summer.
🌡️ Beans and peas aren't interchangeable. Beans generally prefer warmer conditions, while peas prefer cooler weather. If you're choosing between the two, your current growing temperatures may help make the decision for you.
Water and Nutrients for Hydroponic Peas
You don't need a separate nutrient formula just because you're growing peas. Peas can grow alongside other crops in a Tower Garden using the same nutrient solution.
For an established Tower Garden, our standard Mineral Blend rate is 20 mL of Mineral Blend A and 20 mL of Mineral Blend B per gallon of water.
For young seedlings, use approximately half strength — 10 mL of A and 10 mL of B per gallon.
Keep the Tower's pH approximately 5.5–6.5 and check the reservoir regularly as plants grow.
The warning about keeping pea seeds too wet applies primarily during germination in the rockwool. Once the plants are established in the Tower, their roots are growing in an aeroponic environment where they receive both moisture and oxygen.
For more information, see our Tower Garden Nutrients Guide and Tower Garden Water Guide.
Do Peas Need Support?
Usually, yes. Pea plants naturally climb using small curling tendrils that grab onto nearby support as the vines grow.
A trellis, cage or other structure gives those tendrils something to hold onto and helps keep the plant organized around the Tower.
Start directing the vines while they're young. Once several vines become intertwined, separating and redirecting them can be difficult without damaging the plant.
You generally don't need to aggressively prune peas. Focus instead on supporting the vines, removing damaged or dying growth when necessary, and maintaining reasonable airflow through the plant.
Do Peas Need Pollination?
Pea flowers are generally self-pollinating, so you don't need to grow two different varieties together to produce pods.
Outdoors, normal movement from wind and insects helps disturb the flowers. Indoors, gently moving the flowering vines occasionally can help if pod set seems poor.
If you're seeing plenty of flowers but very few pods, also look at temperature, light and general plant stress rather than assuming pollination is the only possible problem.
Can You Grow Peas Indoors Hydroponically?
Yes. Peas can be grown indoors hydroponically, but you'll need to account for their climbing habit.
The plants need strong grow lights, adequate airflow and somewhere for the vines to climb. Position support so the vines don't grow directly into or around your lights.
Indoor growing can actually make temperature management easier if your outdoor climate is too hot for peas, provided the indoor growing area stays reasonably cool.
If you're deciding what else to grow indoors, see our guide to the best compact plants for indoor Tower Gardens.
Common Problems When Growing Peas Hydroponically
Pea seeds rot before germinating
Too much moisture is one of the first things to check. Pea seeds have a tendency to rot when they're sitting in overly wet rockwool. Keep the cube moist, but don't allow it to sit in excess water.
Plants grow but don't produce many pods
Check temperature and light. Peas prefer cool conditions, and plants growing in temperatures that are too warm may struggle even if everything else appears correct.
Plants are stretched or weak
Insufficient light can cause weak, stretched growth. Indoors, also watch the climbing tips of the vines — they may grow away from the strongest part of your grow lights.
Flowers drop without producing pods
Temperature stress, inadequate light or other environmental stress can interfere with pod production.
Vines are tangled everywhere
Add support early and guide new growth as it develops. Pea tendrils will grab whatever is nearby, including other plants.
Common Pea Pests and Diseases
Aphids
Aphids are worth watching for on tender pea growth. Check growing tips, stems and the undersides of leaves so you can catch a population before it becomes established.
Spider Mites
Spider mites can cause stippling and discoloration on leaves. Fine webbing may become visible as an infestation increases.
Powdery Mildew
Peas can develop powdery mildew, particularly when foliage becomes crowded and airflow is poor. It typically appears as a white, powdery coating on the leaves.
Give vines enough space, remove badly affected foliage when appropriate and avoid allowing a dense tangle of growth to build up around the Tower.
Yellowing or Unhealthy Leaves
Not every leaf problem is a pest or disease. Check pH, nutrient strength, temperature, root health and water conditions before deciding how to treat the plant.
For help identifying and managing plant problems, see our Tower Garden Pests & Diseases Guide.
When Should You Harvest Sugar Snap Peas?
Sugar snap peas are harvested while the pods are still crisp and tender. Unlike shelling peas, the entire pod is edible.
As the peas inside develop, the pods become fuller. Don't leave them on the vine so long that the pods become tough.
Once production starts, check the vines regularly. Pods can be easy to miss among the foliage, and frequent harvesting lets you catch them at the stage you prefer.
Use one hand to support the vine while removing the pod rather than pulling hard enough to damage the plant.
🫛 Keep looking. Pea pods have a talent for hiding behind leaves and vines. Once your plants start producing, check them often — especially the less visible side of the Tower.
Are Peas a Good Crop for a Tower Garden?
Yes — particularly when you're looking for something productive to grow during cooler weather.
Peas do require a little planning because of their climbing habit, but they don't usually require complicated pollination or unusual nutrients.
The two things we'd pay the most attention to are temperature and support. Give peas the cooler conditions they prefer and somewhere to climb, and they're a fun addition to a hydroponic garden.
Ready to Grow Sugar Snap Peas?
Living Towers offers Sugar Daddy Sugar Snap Pea seeds for starting your own plants and Sugar Snap Pea seedlings for growers who want to skip germination.
Our seedlings can be grown in Tower Garden, other hydroponic systems, Lettuce Grow, containers or soil.
