Group 2: Large flowering hybrids (mid-June and rebloomers) - bloom on short stems from the previous years growth, often reblooming on the new growth in late summer.  Prune in early spring: remove all dead and weak stems, on healthy stems, prune weak tips back to plump green buds. If plants are pruned after the first flush of flower, they will have better branching, but the second flush of flowers will be lost.