Can anyone help me identify this plant. Someone told me In passing that it needs to be pruned back every Fall, but I’d like to read up on the specifics first.
Thanks for your help!
It looks like some species of yucca to me. Compare http://lifescapecolorado.com/2013/06/why-yuccas-are-our-best-friend/
They don't need any pruning, but you can trim off any dead leaves and remove the old flower stalks in spring.