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In botanical gardens and tea gardens, gardeners trim the plants regularly so that they remain bushy. Does this practice have any scientific explanation?

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Regular trimming makes the plants bushy as this growth is primarily based on the apical dominance of the plants. The apical dominance thus does not allow and in fact, prevents the growth of nearby lateral buds. This happens through the release of certain
auxins. If the shoot apex or the apical bud is removed, then the lateral buds can grow and sprout. This can lead to a bushy growth.

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