Maple River, counting this year. I have ordered over 3000 rhizomes from them. I recommend getting them in the ground as early as possible. They had great survival percentage but the ones planted later were the ones that if I had ones that didn't come up, were in that planting period. All were planted the same way, in tilled soil, 3-4" deep, firmly packed down. I did use a dibble bar in some herbicide killed clay in some experimental plantings and they did as good as any. I am planting most this was this spring.