Everything You Need to Know About Growing Hydroponic Lettuce

Hydroponic lettuce grows in water mixed with a nutrient solution instead of growing in soil. So, if you’re looking for the easiest vegetable to grow hydroponically, lettuce is a good place to start.

There isn’t anything tricky or fancy about growing lettuce, and you can get started with no experience and little money. You can also scale down and monetize your hydroponic lettuce farm with ease.

This guide will teach you everything you need to know about growing hydroponic lettuce, from choosing the right type of lettuce to setting up your hydroponic system.

hydroponic lettuce

How to Grow Hydroponic Lettuce

Growing from Seed

Don’t expect all your seeds to germinate; it will be close to 75% depending on the type of lettuce. Fill your trays with a growing medium and slowly add water to make them moist but not soggy. Mist the seeds regularly to keep the growing medium moist as they develop.

You can transfer your plants to your permanent hydroponics system once you’ve seen a few mature leaves and roots that stick out of the medium.

Transplanting Hydroponic Lettuce

When transplanting your seedlings from the plug trays to the hydroponic lettuce farm, avoid pulling too hard at the new stalks since it can easily kill the plant. Loosen the roots with your fingers and carefully place each seedling into its pot, tucking the roots through the slats so they don’t dangle into the nutrient solution below.

hydroponic lettuce farm

Hydroponic Lettuce Care

Hydroponic lettuce is extremely easy to grow, so it doesn’t require much maintenance once established in your hydroponic system.

Best Temperature for Hydroponic Lettuce

All lettuce varieties prefer cooler temperatures because high temperatures will encourage flowering, making the lettuce leaves bitter. Day temperature needs to be between 68 to 75 degrees Fahrenheit, while night temperatures should be slightly lower, between 60 and 65 degrees Fahrenheit.

Hydroponic Lettuce Nutrients

You can provide hydroponic lettuce nutrients that are specifically mixed for lettuce. This mix will ensure that you get the best nutrient combination for your hydroponic lettuce. General hydroponic nutrient mix can also work as it will yield maximum production when the lettuce is in the vegetative phase and not push it to the flowering phase.

Ensure there’s enough calcium to prevent tip burn. Your solution should be high in nitrogen and phosphorus and not potassium, and keep the solution well aerated to promote growth.

Proper Lighting

Hydroponic lettuce doesn’t require a lot of lighting so you can start with anywhere from 10 to 14 hours of moderate to low light each day. If you give it too little light, it won’t grow efficiently, while too much light may cause the leaves to go bitter. The light quality will also affect red leaf varieties, so it’s good to consider supplementary lighting if you notice your plants look pale.

Hydroponic Grow Medium for Lettuce

When growing lettuce in a hydroponic garden, you need to use a grow medium. There are many different types of grow mediums that you can use, but hydroponic lettuce grows its roots directly in water. Make sure you have a medium that will enable the seedlings to sprout and offer the roots physical support as the plant grows.

You can germinate lettuce seedlings in various mediums, including stone wool and phenolic foam, the most common medium.

The Best Hydroponic Systems for Growing Lettuce

As a grower, you need to determine the hydroponic system that will work best for your specific situation. There are many systems to choose from, and each has its benefits and drawbacks.

The following are some of the most popular hydroponic systems for growing lettuce:

Ebb and Flow System

This system floods the grow tray with water and then drains the solution back into the reservoir. This method is also known as flood and drain.

Nutrient Film Technique

In this system, a thin film of nutrient-rich water flows over the roots of the plants. The sloping channels allow water to drain back to the reservoir. You can control nutrient levels and other factors within the reservoir.

Deep Water Culture

This system submerges the plants’ roots in a deep reservoir of nutrient-rich water. Oxygen is supplied to the roots by an air pump. Large volumes of water ensure rapid changes in temperatures and nutrients are avoided.

The Kratky Method

This method doesn’t use pumps or timers. Instead, the plant’s roots rest in a nutrient-rich solution slowly released into the plant. This is a passive system that doesn’t require much attention. With this method, you can easily own a hydroponic lettuce farm at home without hassle.

hydroponic lettuce nutrients

What is the Best Hydroponic System for Tomatoes?

Plenty of hydroponic systems will work for tomatoes, but which one is best for you will depend on how large of a garden you want and your budget. The best hydroponic system for tomatoes is Eb and Flow because it is a relatively affordable system that can be easily expanded to accommodate larger gardens. Besides buying, you can easily build your own Ebb and Flow system at home.

What is the Best Lettuce for Hydroponics?

You can grow any popular type of lettuce in water. Some lettuce varieties are better suited for hydroponics. They can regrow and replace their leaves, enabling this lettuce variety to prolong its harvest life. These loose-leaf varieties include:

Butterhead Lettuce

This variety has bright green, velvety, slightly ruffled leaves and a sweet butter-like flavor, hence the name. Some types of Butterhead lettuce are dark green or red. The two main subtypes include Boston lettuce, like a rose flower, and Bibb lettuce with a smaller cup-like head. This is also the most commonly grown hydroponic lettuce.

Romaine Lettuce

This lettuce has long, slender leaves with a deep green color. Romaine lettuce is the most popular type of lettuce for Caesar salads because its leaves are sturdy enough to withstand being chopped without turning to mush.

Little Gem Lettuce

This variety is described as a combination of Butterhead and Romaine. It is juicy with a thin center stalk that gives structure without bulk.

Final Verdict

Growing lettuce hydroponically is a great way to get a bountiful harvest of fresh greens. If you’re looking to grow a tasty and versatile vegetable, then lettuce is a great choice. Whether you go for the Romaine variety or one of the others, you’re sure to enjoy the results from any hydroponic lettuce variety.

lettuce hydroponics