The answer to 'why is my shrub brown patches' is that there are several common causes, including drought stress, disease, pests, or winter damage. Brown patches on shrubs can indicate the plant is struggling due to environmental factors or pest/disease issues.
Some key symptoms to look for include discolored, wilting, or dying leaves and branches. The affected areas may start small but gradually spread across the plant if the underlying problem is not addressed. Solutions can range from adjusting watering, applying treatments, or in severe cases, replacing the shrub entirely.