There are many places where raising flower beds around trees can enhance the beauty of an area, and it can also be used as a way to level the ground without taking down the tree. Creating a raised garden bed is relatively simple, but it does take a bit of investment. Wood is not generally used these days because it will eventually rot and need replacement. There are now modern plastics, designed to look like wood, that have a much longer life and look natural.
Preparing the area before building the beds is important, and any plants that will not be part of the landscaping should be removed before starting. If they are not taken out, they could eventually grow up through the soil and choke out the flowers. After they are removed, the box can be placed and soil added. Planting the flowers is the last step in the process.