Check out the instructions on Johnny's Select Seed site. They don't overwinter in Minneapolis, so it's important for us to get one of the varieties bred to work as annuals and to plant them early enough so that you can transplant them while they still get some cold nights (50 degrees) before the season warms up. We've grown Imperial Star (F1) the past couple of years and they've done well for us. They like fertile soil and plenty of sun.
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Bitterwort
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