Oops, what can i do now?
I've had container lilies for a few years now, and what i've done in the fall is take the clump out of the container and plant it in the ground for the winter. When i transplanted to a larger container, i buried the container itself in the ground. Last year, i transplanted them into a much larger container, so for the winter, i put them in the garage where we keep our potatoes and onions. Today i dragged the container out to find that the lilies had sprouted and there are ghostly stems about a foot long. I took it out and it's in the cold frame right now (it's +10) and i'll bring it inside later - had to clear a space for it in the porch.
Can the stems be cut off or trimmed back? I kind of don't think so. Now i'm going to have to rethink this - maybe split the clump in the fall and plant smaller clumps into the ground. Any ideas?