How To Grow Hydroponic Lettuce

Lettuce is the easiest vegetable to grow hydroponically. That’s why it’s a great vegetable plant for beginners to start with and used in so many hydroponic operations. Hydroponic lettuce grows fast, doesn’t take up much space and is easy to maintain.How to grow hydroponic lettuce

How To Germinate Hydroponic Lettuce Seeds

I prefer to start seeds in rapid rooter. It’s best to sow a few seeds to increase the chances of getting a successful seedling and then thin, keeping the healthiest. It only takes a few days for seedlings to show. After the seedlings rise above the starter cube, pinch the heads off of the multiples leaving the healthiest seeding. Make sure to pinch and not pull, or you may disrupt the root system of the seedling you’re going to keep. If you don’t want to start from seed,  you can purchase lettuce in dirt from the store and transplant it into your hydroponic system.

What Is The Best Temperature For Hydroponic Lettuce?

Lettuce is a cool weather crop. Lettuce grows best at temperatures between 55 and 75 degrees, going from warmer during to cooler at night. This temperature also happens to be in the range that you should keep the nutrient solution so it works out well. If your hydroponic lettuce gets too hot it will bolt, which means they start to go into the flowering phase of its life cycle. Lettuce that hasn’t bolted tastes bitter so it’s not good for eating.

Spacing Requirements For Hydroponic Lettuce

Different varieties require different spacing. I found that in most of my gardens about 8 inches apart works well. Loose leaf varieties you can put a couple of inches closer together. Lettuce that forms a firm head should be placed closer to 10-12 inches apart to allow fuller development. Lettuce has shallow root systems so they don’t require a deep grow bed.

How Much Light For Lettuce Production?

Lettuce does not require a long duration or intense amount of light to grow. Hydroponic lettuce should get between 10 and 12 hours of light per day. Since lettuce doesn’t need intense light, you have several lighting options.Many just growing hydroponic lettuce go with fluorescent lighting due to the minimal initial investment, the low power consumption, and low heat production.

Recommended pH For Hydroponic Lettuce

  • pH- The recommended pH level for hydroponic lettuce is 5.5-6.5

Days Until Lettuce Harvest

How many days it takes until you can harvest your lettuce depends on several factors. First, it depends on what variety you’re  growing. Lettuce can take can take 30 to 60 days to fully mature depending on the variety. The second has to do with preference. Growing indoors your able to control the environment allowing you to grow all year. This means your able to cut your lettuce plant down as you want when you want to eat some, then let it grow back until it’s time to cut again. In my 2 ft. x 3 ft. flood and drain I was able to have a salad at about 3 weeks. Cut from a couple of plants one day, another couple the next, spacing out your harvest and you could be able to have at least couple salads a week.

What Systems Works Best For Hydroponic Lettuce Production?

Lettuce can be grown in many different types of hydroponic systems. On a commercial level, nutrient film technique (NFT) is the primary method used. Other methods include water culture and raft systems. In my hydroponic lettuce gardens, I use a variety of methods such as water culture on a smaller scale, flood and drain systems, and nft systems. Below are some pictures of my hydroponic lettuce after I transplanted them into my a flood and drains system a have in my garage.

hydroponic lettuce 1 weeks

1 week after transplant

hydroponic lettuce 2 weeks

2 weeks

hydroponic lettuce 3 weeks

3 Weeks

hydroponic lettuce 4 weeks

4 Weeks


5 weeks

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