Low Income Hydroponics System: Lettuce





Introduction: Low Income Hydroponics System: Lettuce

Indoor Gardening Contest 2016

Second Prize in the
Indoor Gardening Contest 2016

The goal of this project was to develop as cost efficient a system as possible that allows the (relatively) quick production of vegetables on a limited budget. Most of the items required can be purchased on Amazon.com or from your local hardware or pet store.

I set a goal of $20 or less to build out this system without any special skills required.

Step 1: Component List & Prices

1 - 18 Qt Hefty Tub $5.49

1 - Lettuce Nutrients $0.68

6 - 2" Plastic Grow Pots $1.08

1 - Air Stone $2.77

1 - Air Pump $7.12

1 - 2 Feet of Air Tubing $0.40

1 - Check Valve $1.88

6 - Rockwool $0.48

Total Cost = $19.90

Step 2: Setup

The system setup is quite simple and only requires a drill with one 1/4 inch bit and one 2 inch hole saw bit.


  1. Trace the net pot upside down on the inside lid of the Hefty Container. You want to leave room between each pot so you can fit 6 total on the lid.
  2. Use the 2 inch hole saw bit on your drill to drill out the 6 circles you just made on the lid.
  3. Switch to the 1/4 inch bit and drill a hole in the lid in one corner where you will run your airline tubing out from.
  4. Pick a very sunny window, or if you live in a warmer climate, a sunny outdoor location to place your system.
  5. Use warm water and fill the box with 4 gallons.
  6. Add in 5 tsp of the nutrient mix and mix well.
  7. Put the air stone in the bottom of the Hefty box and run the air line in through the upside down top and into the air stone itself.
  8. Place the lid on the bow upside down
  9. Install the Check valve between the air line coming from the air stone and the air pump. The check valve should have a small arrow on it indication the direction of the air flow - make sure this arrow is pointing towards the air stone.

  10. Insert the free end of the air line into the pump and plug in.

  11. Push the rockwool down into the net pots so that they are sitting in the water some.
  12. Add your seeds to the center of the rockwool once it has soaked up the water some - maybe 5-10 minutes
  13. Sit back and watch - just make sure to keep the water level up so that the bottom of the pots remain in contact. Once you have a strong root system, they can easily pull the water up if it slips below a little

Step 3: Plant Seeds

Once you have the setup complete, simply plant your favorite seeds in the rockwool and sit back. I have been harvesting lettuce in 24-28 days...

Enjoy your inexpensive and healthy crop!

Step 4:



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    First, thank you for well written descriptions and figuring out something I can try without a lot of financial risk.

    If I want to grow lettuce can I just keep clipping leaves off and let the plant grow more?

    Thank you.

    Yes, as long as you pick a leaf lettuce to plant like Red Sails, you can pick leaves and it will continue to grow, I try not to pick too much from a single plant if I want this to work, maybe no more than a 3rd of the leaves at any one time. Then I let that plant go for a week or so to regain it's strength.

    How long from seed to harvest? How many heads can you grow at once? My wife spends about $12 per week on lettuce feeding her 9 tortoise's !!!

    28 days form seed to harvest was the best I have hit (I only have 1 Russian Tortoise) to feed. It seems to average about 30 days.

    Can you tell me how to mix the super plant food? Mine didn't come with any instructions on how much to put in how much water help

    I have not had to add in additional nutrients, I just top off the water when needed. After I harvest, I start from scratch again with a new batch mixed up.

    If you purchased the exact same Fertilizer that I did, you will use warm water with the following ratio:

    4 Gallons of tap water
    5 Tsp of Nutrient Mix

    And how often do i add more nutrients to the water? Thank you for your help, these are things I can't seem to find anywhere.

    I wonder if I can use this as an aquaponic system