The answer to 'frequency of flower bed' is that most flower beds should be replanted or refreshed every 1-2 years. Annuals, which complete their life cycle in one growing season, typically need to be replanted each year. Perennials can often last 2-3 years before needing to be divided or replaced. Proper soil preparation, mulching, and maintenance will help maximize the lifespan of your flower beds.
The frequency of replanting will depend on the specific plants, climate, and level of care. In general, plan to refresh annual flower beds each spring and divide or replace perennials every 2-3 years. This will keep your flower beds looking vibrant and healthy.