The answer to 'why is my flower bed dying plants' is that there are several common causes, including overwatering, underwatering, pest infestations, disease, and poor soil conditions. Symptoms may include wilting, discoloration, stunted growth, or complete plant death.
To troubleshoot the issue, start by checking the soil moisture - the soil should be moist but not waterlogged. Inspect the plants for signs of pests or disease, and consider testing the soil pH and nutrient levels. Making adjustments to watering, pest control, and soil amendments may help revive the plants. However, if the problem persists, it's best to consult a professional landscaper who can diagnose and treat the issue properly.