I have some ginger planted along a couple walls. It gets about 6 feet tall, with salmon-colored flower spikes in late summer. It dies back in winter. I cut the stalks down when the frost hits, and I pluck them out in Spring. This year, some of the stalks are limp, ratty, and firmly in the ground beside the new growth shoots. They don't want to budge. Should I yank out those stalks, or cut them off (they're about a foot high), or just let them rot where they are?