Many people think that you have to treat shrub roses like you would hybrid tea roses by mulching their crown for winter and pruning them at a certain place. Not so with shrub roses. They are very low maintenance plants. Don’t be afraid to cut them back considerably in the spring so that they are reshaped to grow into the space provided later in the season. They can take major pruning. I would suggest that you wait to cut them back until they are about to push new growth for the season in case we have late frosts that might cause them to die back an inch or two.