Rake leaves into a pile and allow it to dry if wet. Wet leaves will not crumble mowed as well as dry leaves. Place a tarp over drying leaves during rain and secure with garden rocks.
Spread the leaves into one long pile 1 foot in height. Run a lawn mower back and forth in a zigzagging motion over the leaves to chop them up. Continue running the mower over the pile until the leaf pieces are about 1/2 inch in length.
Place a 2- to 3-inch layer of leaves directly under the myrtle and around groundcover plants. Placing the leaves directly on the ground after chopping them results in a sheet compost -- the leaves decompose on the ground as opposed to inside a compost bin. Alternatively, rake the leaves into a compost bin, alternating 12- to 18-inch layers of leaves, a sprinkling of urea or grass clippings and a sprinkling of water.
Add a 1/4-inch layer of grass clippings or a sprinkling of urea on top of the sheet-composted leaves and spray them lightly with water.