Paeonia Katmata Fuji (suffruticosa - tree) Semi double lavender pink cup shaped flowers with golden stamens. Tree peonies have a bad rap of being hard to grow but if you have the right conditions, they are very easy and fairly low maintenance. The major things tree peonies need are full sun, lime, protect from strong winds, moisture while growing and mulch to keep the roots moist and cool. Nurseriesonline.com.au have a great article on how to make your tree peonies thrive if you are considering growing them. Suffruticosa refers to the woody stems (tree) that they shoot from and remain above ground when dormant in winter.