The answer to 'how to install flower bed' is to first prepare the area by clearing any existing vegetation, leveling the soil, and adding compost or other organic matter to improve drainage and nutrient content. Next, mark out the desired shape and size of the flower bed using a garden hose or string. Dig a shallow trench around the perimeter, then use a rototiller or garden fork to loosen the soil within the bed. Add any necessary soil amendments, such as fertilizer or pH adjusters, and mix them in thoroughly.
Once the bed is prepared, you can start planting your flowers. Space them according to their mature size, and water the plants well after planting. Finally, add a 2-3 inch layer of mulch around the plants to help retain moisture and suppress weeds.