Last year, I planted mums and then this winter they frosted and the blossoms are brown and papery. For them to bloom again this fall, do I need to cut off last year's blossoms? I'm very new at gardening and would like to enjoy the mums come this fall. Please help, thank you!

My experience with mums is that when you cut of the dead parts, they grow better. You might want to look it up, but that has worked for me.