To control growth and manage the size and shape of your plants, the time to prune varies according to the climate. In tropical zones, where there is no danger of frost, experts recommend pruning Princess flower right after the summer growing season. This allows the plant to rest and begin producing new growth. In temperate zones, the recommended time to prune the plant overall is early spring, after the winter and any frost, but prior to the summer blooming season. Avoid pruning in late fall unless you are in a tropical zone as pruning can reduce cold weather hardiness. Additionally, you may want to trim the plants throughout the growing season to encourage blooming. You can also prune at any time if there is any yellowing or diseased foliage.