Try to keep your garden tidy by lining up all the plants in rows of five identical ones to clear space. In order to root up and replant your plants in the right place there will need to be room for you to walk from one place to the other, so make sure there is a path cleared between a flower and where you want it to go. Good luck!
Use the mouse. Click a plant to pick it up, click a free space to replant it.