I planted three small seedlings of creeping thyme a couple years ago and now it has grown into an evergreen carpet along our stepping stones. Creeping thyme forms roots anywhere the stems touch a surface. Essentially if the area is dark, roots will grow! Even though our creeping thyme is resting on a stepping stone it still produces a copious amount of roots which makes an awesome opportunity to create more creeping thyme. All I need to do is trim the area around the stepping stone then separate the rooted stems of thyme into individual pots or into new areas of the garden to cover. This propagation process is known as layering.
You might be wondering why a groundcover like creeping thyme is useful? Maybe you already know but we'll mention it anyway! Groundcovers are a living mulch. In a garden anywhere light touches will help germinate a seed. You've heard the saying "Nature abhors a vacuum", by keeping the ground covered with a mulch of some kind will prevent weeds from getting what they need to sprout and eliminate any vacuums. It also keeps the soil cooler in the hot summer. Creeping thyme can tolerate the hot summers here in Tennessee very easily. By placing it underneath and around shrubs it can help keep the moisture in the soil where it will work for the shrubs. Without some type of mulch the water will quickly evaporate. Creeping thyme has very shallow roots and doesn't need much water so planting it with other plants that use more water is a great idea. Creeping thyme would make an excellent groundcover for a formal herb garden.
Creeping thyme can take some light foot traffic which makes it a good ground cover for small pathways that are only used occasionally or stepping stone pathways. You wouldn't want to plant it in a heavily used area. Light traffic will help it too root even better as the occasional foot pressing the roots to the soil will just help the thyme get a better foot hold into the soil.
Do you have creeping thyme growing in your garden yet?