Do you cut it back or snap off the stem after the Foxglove blooms?

I found this, maybe it will help. I know I leave mine on after they have bloomed, since they only bloom once a year.Seasons of Interest: Foxgloves have strong seasons of interest with the grey-green leaf rosettes, the interesting summer flowers and the winter seed heads some gardeners leave standing for interest in the fall and winter.

http://plantsbulbs.suite101.com/article.cfm/foxglove_plant_profile#ixzz0HcoG11Vp&D