Rose of sharon is an example of a shrub that is so vigorous that a problem frequently associated with it is getting rid of all those unwanted seedlings that sprout up, naturally. For this reason, rose of sharon is not a low-maintenance shrub. Of course, if you wish to start rose of sharon from seed, you can turn this "problem" into an advantage.
Other shrubs are not low-maintenance due to their proclivity to produce suckers (which will often have to be removed). A different kind of "unwanted growth" is sometimes witnessed on azaleas: In this case, we're talking about odd lumps that don't belong on the shrubs, growths that look like something out of a science fiction movie!
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