I second what Porkpal says about Sea Foam. Mine has 10' long octopus arms, and I pegged a few with rocks, and they rooted quickly. Sea Foam starts blooming early in spring, and was still at it last week. Some blossoms are downright pink, while others are pure white. I wish I had planted this one the banks of the pond. Mine seems to resist all disease, even in this rainy year when so many others got blackspot for the first time.