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I plant ONE LARGE 25 gallon (abt 100 liter) grow bag per type of onion, and also, in the smaller bags 7 gallon (abt 25 liter) I plant a pepper plant and a couple of onion, too.

Aww that is a very great idea for growing spices my dear friend @bluefinstudios . Grateful of the link, and I will check on that. Happy planting my friend. Have a nice time and take care.