Siberian iris are slimmer more refined than Dutch iris, like ballet dancers on point. These came from my grandparents yard to our yard where I grew up. Then they were divided and moved with my parents to a townhouse downtown. They were divided again when they moved to a suburban apartment. Another division occurred when mom bought a condo in a small neighboring town. Now I have divided them again and they are in my perennial border. This June I'll take a clump to the plant trade.