I'll second that, DD.
I'll have to get a picture of one my mom tossed over the fence at the end of last fall. Some branches were tossed over it, and its bottom is touching the ground, but that's it...and not only is it still alive, but it has a bloom!
My hugel mum bed is just about there...one plant is being stubborn, but it has buds so it's just down to the race against the freeze now.
And here's the planter mums...the carryovers I neglected to pinch, and the ones the nursery pinched for me.
My care regime this year is going to include resetting my mums once they're done blooming, so that they're halfway out of the soil. The newer ones that overwintered the best for me last year had the top third of their rootballs exposed. The ones that sulked this spring were the ones that were buried to the top.