The answer to 'why is my shrub bare spots' is that there are several common causes, including lack of sunlight, improper watering, pests or disease, and age or overcrowding. Bare spots on shrubs can indicate an underlying problem that needs to be addressed.
One of the most common causes is insufficient sunlight. Shrubs require a certain amount of direct sunlight to thrive, and if they are planted in a shaded area, they may develop bare spots as the foliage becomes sparse. Another common issue is improper watering, either too much or too little. Shrubs need consistent moisture, but overwatering or underwatering can both lead to bare spots.