The answer to 'why is my shrub overgrown' is that shrubs can become overgrown for several common reasons, such as lack of regular pruning, excess nutrients, or improper planting. Overgrown shrubs can become unsightly, block views, and even damage nearby structures.
Some of the most common causes of overgrown shrubs include not pruning the shrub regularly (usually once or twice per year), over-fertilizing which can lead to excessive growth, and planting the shrub in the wrong location where it has too much space to expand. Symptoms of an overgrown shrub include dense, tangled branches, leaves or needles crowding the interior, and the shrub growing beyond its intended size and shape.