If you prune now that it is spring you will be removing blooms. However, it may be necessary to build some lower branching and shape the plants into more full specimens. Pruning at the end of the bloom period would be better. If you plants are still blooming in September, which is likely, go ahead and prune them then. Pruning later can adversely affect the following spring's growth, and make the plant more susceptible to cold weather. I'm not sure which Monrovia variety you have but it may be that those plants won't get much larger than 4 feet. Monrovias two pink dwarf types are 'Turner's Carnival' which reaches 3-4 feet, and 'Turner's Tickled Pink' which reaches 4-6 feet in time.
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