Collect Green Onion Seeds
Most of green onions on the farm were grown from store bought onions. Green onions (a.k.a. scallions) you get from grocery stores come with roots. If you save about 2-3 inches from above the roots and stick them in the soil, they will start to grow. You will then have endless supply of green onions.
They will flower and each pompom looking flower is actually a cluster of small flowers. Bees love onion flowers. I often wonder what onion blossom honey tastes like. After the flowers dry up, you will see little black specks of seeds in each tiny flower. Each cluster of flowers probably produces nearly 100 seeds depending on the size.
I have grown some green onions from seeds. They grew very slowly in compare to just planting the roots from store bought onions. However, you do get more tender green onions if you grow them from seeds. I am collecting various seeds for the next seed exchange gathering in the fall.