Prune your Peter Pan Saxifraga in the early to mid summer immediately after the flowers have finished blooming for the year.
Cut away any dead or diseased foliage and woody stems and also cut back any stems that have become defoliated. Take these down to a point of live, healthy tissue, or all the way down to the soil line.
Shrink the boundaries of the plant by reducing the tips of branches that extend beyond the desired boundaries. Place cuts just above a healthy leaf node.
Collect all of the cuttings carefully so that they are not left to decay in the ground cover, marring its appearance and inviting disease or pests.