I grew these from mustard seeds just as an experiment. I wanted to see if I could get them to grow. They did! I’ll harvest more mustard seeds from them, and then use those in my cooking.
Mustard self-seeds so easily that it’s likely you’ll have mustard plants come up again and again. I started with a few purple mustard plants grown from purchased seed. Five years later they now pop up here and there in the potager. I harvest some for leaves in early spring, weed some out if they are crowding something I want more, and let the rest just provide pretty yellow flowers and purple-streaked leaves. The pollinators enjoy them, too.
Allison Creates 
Mustard self-seeds so easily that it’s likely you’ll have mustard plants come up again and again. I started with a few purple mustard plants grown from purchased seed. Five years later they now pop up here and there in the potager. I harvest some for leaves in early spring, weed some out if they are crowding something I want more, and let the rest just provide pretty yellow flowers and purple-streaked leaves. The pollinators enjoy them, too.
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That sounds great! Volunteer vegetables are always appreciated!
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