At a Flower and Garden show 2 days ago I bought some bare root white Liatris bulbs or corms. I have only bought these potted before, never in bulb form (I did not even know they were bulbs/corms until recently). With the extremely warm weather we have been having, I think I need to get these in the ground as soon as possible. There are no sprouts as of yet.

How deep should I plant them? And, should they be planted individually, or as a cluster to make a good sized clump? Thanks!