Last year we started a new flower bed, and on one end I planted a good size area with crocus. About a 12 foot semi-circle. They're just now poking up through the snow/permafrost that we have been inflicted with this year. I've kept this bed mostly purple, and yellow in nature. I've been looking for something to plant over the top of the crocus. Since these are at the front of the bed I need something fairly short. Right behind them is a Walker's Low catmint. The exposure is full sun after about noon. I don't see any evergreen type of ground cover working or the crocus won't be visible in the spring. Am I right in thinking it needs to be something that either goes dormant in winter, or that we cut down to the ground in the fall. I also don't want anything that has to be watered on a daily basis.

Thanks for your ideas.

Scotty