In early spring as this rose’s leaf buds are beginning to swell, it’s a good idea to cut the whole plant back by about half to one-third its total height. Doing so removes the thinner stems at the top of the plant and ensures that the growth for the new season comes from the heartier buds further down the stems. Don’t sweat exactly where you cut the stems too much. Simply cut right above where a nice, big bud is emerging on the stem.
When you prune your roses in spring, feed them with a granular rose food. This will help them start the new season off right with plenty of nutrients to support the new growth.
Oso Easy Peasy is a self-cleaning rose, meaning its spent flowers will naturally drop their petals. New flowers will form on the stems whether or not you remove the old blossoms, but you could choose to do so for sake of appearance.