The answer to 'how often to flower bed' is that most flower beds should be refreshed and replanted 1-2 times per year, in the spring and fall. Annuals, which complete their lifecycle in a single growing season, typically need to be replanted each spring. Perennials, which return year after year, may only need division and replanting every 2-3 years. The exact frequency will depend on the specific plants in your flower bed, your climate, and how well-established the bed is.
Refreshing your flower bed regularly helps keep the plants healthy, encourages new growth, and maintains an attractive appearance. Plan to add new soil, compost, or mulch, remove weeds, and replant any annuals or divide perennials as needed. This will ensure your flower bed continues to thrive and look its best throughout the growing season.