If you like onion, the Walking Onion is a fun one to grow. Completely edible from the bulbs to the greens to the little bublets that grow on it's tips, this mild tasting onion is a great conversation starter as well. It starts out growing like green bunching onion, but then these little bublet clusters form at the tips.
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They start to send out crazy looking "arms" and then get heavy and cause the stalk to tip over. When the bublets touch the ground, they root and start a new bunch, which is why the onion seems like it is "walking". Great in stirfry, or raw in salads and sandwiches, and fun to look at in your garden!