Evergreen ground covers are one of the most sought-after lists of plants - particularly for shade areas. Many plants simply don't qualify as "ground covers" because they don't spread very well, aren't short enogh to be considered "covers" (under 24-inches and preferably under 12-inches) and/or are not dense enough to even begin to inhibit weeds.
We include these two links to help determine how few or how many plants it will take to do the job.
Choosing, planting and care for groundcover
Location, Selection, and Establishment for groundcover