The mini roses were bred for intense growing conditions and are prone to black spot. I also wait until the roots are growing well, divide and plant, using them for borders around my "big" girls. I treat them just like their larger sisters but do keep a tight schedule spraying for black spot. It is a wonderful surprise seeing just what they can do under regular garden environments. My favorites are a tiny 5"x12" yellow whose 2" blooms look like yellow shells tied together and a deep red floribunda type that has been moved to the coveted corner at the gate, she is 24" x 12" and blooms all summer.