The answer to 'flower bed brown patches' is that they are often caused by a variety of issues, including drought, disease, pests, or improper soil conditions. The symptoms can include discolored, wilted, or dying plants in isolated areas of the flower bed.
Some common solutions include improving soil drainage, adjusting watering schedules, applying fungicides or insecticides, or replacing damaged plants. In some cases, it may be necessary to completely renovate the flower bed if the issues are severe or widespread.