The best groundcovers solve trouble spots in the garden or landscape. These often low-growing plants are easy-to-grow and frequently used to cover bare spots and choke out weeds. In many cases, they reduce time spent weeding and the expense of mulch. Gardeners plant groundcovers in challenging areas of the garden and landscape, such as on slopes, between rocks and under trees. Many ground covers are very decorative, providing pretty foliage and flowers. When buying groundcovers for sale online, make sure the plants are suitable for your grow zone. Other factors to consider are the plants' light requirements (full sun, partial shade or full shade), soil requirements, water needs, mature height and spread, and flowering time.