Growing Peppers Hydroponically: A Complete Tower Garden Guide

Can You Grow Peppers Hydroponically?

Yes. Peppers grow very well without soil and are well suited to hydroponic and aeroponic growing systems, including Tower Garden.

Instead of relying on soil for water and mineral nutrients, the roots receive what they need from the nutrient solution circulating through the system. Tower Garden uses an aeroponic growing method, circulating nutrient solution from the reservoir over the plant roots before it returns to the reservoir.

The main consideration isn't whether a pepper plant will grow hydroponically. It's whether you can give a mature fruiting plant enough light, space and support to produce well.

If you're new to growing without soil, our Aeroponics 101 guide explains how aeroponic growing works and how it differs from hydroponics.

Best Pepper Varieties for Hydroponic Growing

You can grow both sweet and hot peppers hydroponically. When choosing a variety, think about the size of the mature plant, not just the size of the pepper it produces.

Not sure which type to grow? Browse our complete pepper collection to compare sweet, hot and compact pepper varieties available as seeds and seedlings.

Starting Peppers from Seed

We generally start one to two pepper seeds per rockwool cube. Pepper seeds can take a little patience to germinate, and some varieties are slower than others.

Keep the rockwool moist while the seeds germinate, but don't leave the cubes sitting in water. Warm conditions are necessary when starting pepper seeds.

Once the seedling is established and about an inch in size, it can be moved into the Tower Garden.

Ready to start your own? Browse our pepper seeds, or visit our Seeds & Seedlings Guide for more information about starting plants for a Tower Garden.

Where Should You Plant Peppers on a Tower Garden?

A young pepper seedling doesn't take up much space, but mature plants can become wide and heavily branched. Give them room to grow outward and think about what they'll shade as they mature.

• Avoid crowding several large fruiting plants together.
• Consider whether the mature pepper will shade lettuce, herbs or other smaller crops.
• Leave room to reach the plant for pruning and harvesting.
• Plan for support before branches become loaded with fruit.

You don't have to fill every Tower Garden port. Giving fruiting plants enough space often produces a healthier, easier-to-manage garden than trying to fit as many plants as possible onto the tower.

How Much Light Do Hydroponic Peppers Need?

Peppers are high-light plants. Outdoors, give them plenty of direct sunlight. Indoors, they need strong grow lights positioned close enough to provide adequate light across the entire plant.

One of the confusing things about peppers is that a plant can look green and healthy without receiving enough light to be highly productive. Growing leaves requires less from the plant than flowering, setting fruit and developing a crop of peppers.

For indoor Tower Gardens, we generally run grow lights for approximately 14–16 hours per day and give plants complete darkness overnight. Tower Garden grow lights should generally remain approximately 6–8 inches from the tops of the plants as they grow.

See our Tower Garden Light Guide for more information about outdoor sunlight and indoor grow lights.

What Temperature Is Best for Growing Peppers?

Peppers are warm-season plants and generally prefer warm growing conditions. They don't appreciate cold temperatures, but extreme heat can create problems too.

When conditions become excessively hot, pepper plants can become stressed and may drop flowers or struggle to set fruit even while the plant itself continues growing.

That's particularly important in hot climates like ours in South Florida. Plenty of sunshine doesn't necessarily mean perfect fruiting conditions every day of the year.

Water and Nutrients for Hydroponic Peppers

As pepper plants grow larger and begin producing fruit, their water use increases. Check the reservoir regularly rather than assuming it will need the same amount of water every week.

For established plants, we normally use Tower Garden Mineral Blend at the standard rate of 20 mL Mineral Blend A and 20 mL Mineral Blend B per gallon of water.

For young seedlings, we start at approximately half strength — 10 mL A and 10 mL B per gallon.

During very hot weather, plants can become stressed more easily and we may temporarily reduce nutrient strength to half or even quarter strength depending on conditions.

• Keep the reservoir from running too low.
• Maintain a pH of approximately 5.5–6.5.
• Use lower nutrient strength for young seedlings.
• Reduce nutrient concentration when heat is placing additional stress on the plants.
• Periodically drain and refill the reservoir rather than topping it off indefinitely.

You also don't need separate nutrients for peppers if you're growing them alongside lettuce, herbs or other crops in the same Tower Garden.

For more detail, see our Tower Garden Nutrients Guide and Tower Garden Water Guide.

Do Pepper Plants Need Pollination?

Yes. Pepper flowers must be successfully pollinated before they can develop into peppers.

Peppers are self-pollinating, which means an individual flower contains the parts needed for pollination. Outdoors, wind, insects and normal movement of the plant often provide enough help to move the pollen.

Indoors — or in protected areas without much wind or insect activity — you may need to help. Gently shaking or vibrating flowering branches can encourage pollen movement.

For more information about pollinating fruiting crops, see our Hand Pollination Guide.

Pruning and Supporting Pepper Plants

Pruning isn't only about keeping a pepper plant smaller. Strategic pruning can encourage the plant to branch out and develop more growing points, which can help create a fuller plant and potentially increase the number of places where flowers and peppers can develop.

This can be particularly useful with pepper plants that are growing tall with limited branching.

• Remove damaged, unhealthy or badly yellowing growth.
• Prune strategically to encourage branching when appropriate.
• Thin excessively crowded growth if airflow and light are becoming restricted.
• Avoid repeatedly removing large amounts of healthy growth from a stressed plant.
• Watch fruiting branches as peppers gain size and weight.

Support requirements depend on the variety. Compact peppers carrying small fruit may need very little help, while larger plants — particularly those carrying several full-size bell peppers — can develop heavy branches that benefit from a cage or other support.

As with tomatoes, it's easier to support the plant before branches are bending under the weight of fruit.

Can You Grow Peppers Indoors Hydroponically?

Yes. Peppers can grow and produce indoors, but they're a fruiting crop, so indoor conditions need to support more than leaf growth.

The three biggest things to plan for are light, mature plant size and pollination.

Compact pepper varieties are particularly useful indoors because they're easier to fit beneath grow lights and are less likely to overwhelm nearby plants.

• Choose a variety that fits your available growing space.
• Provide strong grow lights for 14–16 hours per day.
• Keep lights positioned correctly as plants grow taller.
• Allow complete darkness overnight.
• Help pollinate flowers when natural movement is limited.
• Prune and support the plant as necessary.

Common Pepper Problems in a Tower Garden

If a pepper plant isn't producing the way you expected, look at the entire growing environment before changing several things at once. Light, temperature, nutrient strength, pH, water availability, pollination and plant maturity can all affect production.

When troubleshooting, try to change one thing at a time. If you change the nutrient strength, pH, lighting and watering all at once, it's difficult to know what actually solved the problem.

Common Pepper Pests in a Tower Garden

Growing without soil eliminates many soil-related problems, but it doesn't prevent insects from finding your pepper plants. Regularly checking the leaves — especially the undersides — can help you catch a problem before it becomes a large infestation.

Don't treat every damaged leaf the same way. The correct approach depends on whether you're dealing with an insect, disease, environmental stress or simply an older leaf reaching the end of its life.

For help identifying problems and choosing the appropriate treatment, visit our Tower Garden Pests & Diseases Guide.

When Should You Harvest Hydroponic Peppers?

One of the nice things about peppers is that you often have some flexibility about when to harvest them.

Many peppers can be harvested while they're still green or allowed to remain on the plant until they reach their mature color. Depending on the variety, that may be red, orange, yellow, purple or another color.

Bell peppers, for example, are commonly harvested green but will usually become sweeter as they mature to their final color. Hot peppers can also change in flavor and heat as they mature.

Harvest peppers carefully rather than pulling hard on the fruit. Pepper branches can be surprisingly brittle, particularly when they're carrying several peppers.

Growing Peppers Successfully in a Tower Garden

Peppers are one of our favorite fruiting crops for Tower Gardens because there are so many varieties to choose from and a healthy plant can continue producing for a long time.

Give them plenty of light, keep an eye on water and nutrient strength, help with pollination when necessary and don't be afraid to prune a healthy plant to encourage branching and keep its growth manageable.

Most importantly, pay attention to the plant rather than following a rigid schedule. A pepper growing indoors under lights has different environmental stresses from one growing outside through a Florida summer. Understanding what the plant is telling you makes troubleshooting much easier.