We had booted the aquaponics system with green onions and found that they grew fantastically. In a matter of days, they sprouted an amazing amount. The plants play an important role in eliminating the nitrogenous content (nitrate) from the water, as they absorb it as nutrients. It's an amazing feature programmed in nature that something so toxic to one organism should be needed by the other after a small transformation. When the water is returned to the fish, it is clean and ready to once again, be filled with nutrients. Hence, the plants and the fish fulfill their natural symbiotic relationship.
Green onions are really "green" because they can be regrown after they are harvested. So long as the bottom part of the plant is left, the green onion can keep growing and get harvested a few more times before its final harvest.
The other plants that are visible in the picture are lettuces, kale, and Chinese celery.
Let us know in the comments below what other plants you'd like to see grown.
Potato.
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