They don't need soaking. They are biennial though, so unless you start them very early in the season, they might not bloom the first year. There are a lot of varieties that simply self-seed when they are established.
Plant them together with coreopsis, ladies mantle or my favorite: artemisia absinthium to hide the "ugly" stem. Common names for this artemisia are: wormwood, green ginger, sweet sage. Happy gardening!
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