Green Onion Scallion Mason Jar Promulgation Regrow

Update: 2026.04.20. I created a slightly larger version for those thumb-sized green onions. 

Easily regrow green onions or scallions at home with this 3D printed propagation lid designed to fit standard Mason jars. Each lid features multiple planting holes to hold cut scallion bases upright, allowing their roots to grow in water below. Perfect for a low-maintenance, sustainable kitchen garden—just add water and watch your greens flourish!

There are two models: one is close bottom and the other one is open bottom.

If you experience smelly green onions after a while, it is because they are experiencing root rot. Root rot is a plant disease where the root system decays due to fungal or bacterial infections, often caused by overwatering or poor drainage that leads to oxygen deprivation. It can be fatal if left untreated, depriving the plant of essential nutrients and water.

~ To avoid root rot, only fill the water line up to the root and not cover the whole root and stem. You can also use this grower to place them directly into a small soil jar to prevent root rot as well. ~

Household Green Onion Scallion Mason Jar Farm Re Grow Hydroponic Kratky