This jar hydroponic system is designed to re-grow leftover green onions. Using a metal ring is optional. The system is reusable and should be hand washed in cool water and then allowed to air dry. Directions: Cut store bought or home grown green onions about 1-2 inches above the root. Place in the the green onion farm lid. Then place the lid in a jar of water. Plain water is fine to use however if your going to harvest the onions multiple times you may like to use a small amount of liquid nutrients. To harvest, simply cut the tops off the green onions with a pair of scissors about 1-2 inches above the root. The green onion will continue to grow and produce food for your table. It takes about a week to re-grow your green onions. And you should be able to harvest it at least 3-5 times before replacing them. Wide Mouth Jar is not included. ***** If you have any questions about Aerogardens, Kratky or Hydroponics please join our support group ***** https://www.facebook.com/groups/218267669995724/