The answer to 'why is my flower bed erosion' is that there are several common causes of flower bed erosion, including heavy rainfall, poor soil drainage, and sloping terrain. Symptoms can include soil loss, exposed plant roots, and uneven or sunken garden beds. To address flower bed erosion, solutions may include adding mulch, planting ground cover, building retaining walls, or improving drainage.
If the erosion is severe or you're unsure of the best approach, it's generally best to consult a professional landscaper. They can assess the specific causes and recommend the most effective solutions for your garden.