For your major pruning, use sharp pruning sheers that will make clean cuts to avoid damaging your plants. Make each cut at a 45° angle to encourage healthy new growth. Remove any dead or decayed stems first, cutting them off just above the damaged section or cutting them completely to the ground. Next, consider the desired height and shape of your Princess flower, and then prune accordingly. To control the size of your Princess flower, you can cut back as much as a third of its height and girth . Late winter or early spring is the best time to do so. Finally, you may prefer to just trim off dead or damaged portions of the plant, including deadheading spent flowers, to keep it looking its best. This can be done at any time of year. Diseased or damaged stems should be cut right at the soil line and removed completely. Blooms should be cut off just below the flower head. Princess flower is generally vigorous and will not be harmed by pruning. But take care if you live in an area where freezing is likely. If you cut back the stems down to the woody section shortly before a freeze, this can allow water to travel through the stem to the roots, where it may freeze and kill your Princess flower.