Introduction: DIY Hydroponic Green Onion System!

Looking for an activity that reduces food waste and plastic pollution! Growing Green onions hydroponically is fun and smart! Using everyday items and making them into hydroponic garden!


  • Clear plastic container ( we used a clear plastic egg carton)
  • 12 or more green onions ( store bought or garden grown works)
  • Small rocks ( any). They can also be glass beads (etc.)

Step 1: Gather Your Starter Onions

Here I am using small walking onions that I gathered from my garden, but this is also the perfect use for typically discarded scallion bottoms (roots), or even pearl onions from the produce section. You will need 12 starter onions total.

Step 2: Gathering Your Rocks

To gather your rocks you can just go outside grabs some. If you can’t find rocks or don’t have any, you can also use glass beads or other thing you think might work. I’m using rocks from my drive way. Your rocks have to be small, so they fit in the egg carton. When you finish gathering the rocks, wash them to get ant extra dirt off.

Step 3: Assembling Your System

To assemble your system, you first have to cut the top off of your egg carton. Cutting off the top allows the onions to grow tall. Now you can put a couple of rocks in each one. After putting the rocks in the carton you can put the onions in. Fill each section with water about 1/3 of the way or until the water is touching the roots.

Step 4: All Done!

Now you are all done! Occasionally water your onions when the water gets low. Trim the green tops and use in your favorite recipes! New green shoots will appear as you trim the older ones. Do not feel like you have to trim them! Watch as little white roots come out of the onions! Soon your onions will be tall and ready to eat!

Indoor Plants Challenge

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Indoor Plants Challenge