Michael Eckardt asked about the safety of dividing the rhizome. Purely from what I've read, you can do it however there is always a risk especially once you disturb the roots of one of these beauties. I'd love to have your problem though! ;-) -- Steve Pushak Vancouver, BC, CANADA Visit "Steve's Aquatic Page" http://home.infinet.net/teban/ for LOTS of pics, tips and links for aquatic gardening!!!