dividing asiatic lilly
I have a couple Asiatic lillies I would like to divide and transplant. I don't remember which one it is but it's a beautiful blood red and this year it was it's 3rd year I think since planting and it's gotten alot bigger. This lilly also seems to keep uncovering it's base from under the soil. We keep covering it up each year, but it keeps almost uprooting itself. Is this normal?
How and when do I go about dividing and transplanting some of this lilly?