These are a wonderful native plant that will bloom later in summer and are a magnet for butterflies, bees, and other pollinators. Just plant them in a sunny spot and water them. They don't like to be too wet, but they will need a little TLC until they make themselves at home. They are an incredibly heat and drought tolerant plant.
If you bought liatris corms, soak them for an hour or two in water. It can be very difficult to tell which way is up, so don't worry too much about it and just plant them in a sunny spot, they'll figure it out.