I just bought some Liatris bulbs (20 in a pack) from Fleet Farm. My question is, should I plant them now or keep them in a dry, cool area and plant them next spring?
You could do either option.
You may even want to plant up the corms in February for a head start for you next year garden.
Start them in a good quality potting mix and keep watered and warm. When the plants emerge you will need to place them in a good sunny location or under a grow light until the danger of frost is over.
Here is a link with more information.
Follow the directions at the end of the article if you choose to hold the bulbs until spring.