what specifically are they??

if you don't know, tell us how big, what colour, leaf size and any other aspects and we'll try to figure out.

it may appear to be one big bulb but is probably just a lot of smaller ones joined together. depending on the species, but for most, the bulb staying above ground is fine, they are just becoming very mature.

My immediate thought is that you should dig around one side, out from the cluster, and then gently work on removing a bulb or two from the cluster and see how that goes. If it goes well, you can proceed to remove as many as you want, and then replant them lower in the ground. New roots will emerge from the previously exposed upper portions of the bulbs and will help the plants to grow larger this year. I, too, would like to know what kind they are!

LariAnn Garner

Here is a link that might be useful: Aroidia Research