Did you realize you can get more flowers by cutting your plants off before they bloom, or sometimes, after they bloom, or even while they are blooming? It all comes down to knowing the plant and its habits. These are things that the plant tag and the nurseries don’t generally explain to you when you shop.
It’s hard to find information on how to keep a particular plant looking as beautiful as they show you in the picture. The fact is that you can’t usually buy a plant and expect it to grow exactly as you had hoped without some intervention. You need to experiment with “Pre-bloom shearing”, “Post bloom shearing” and “Deadheading”.