Spotted dead nettles are valued as perennial ground covers for the shade that will spread and fill in a patch of ground that might otherwise remain bare (except for weeds). In warm regions and/or in sheltered areas of your yard, they may be evergreen. Elsewhere (and depending on growing conditions), they are more likely to be semi-evergreen, herbaceous plants. Both their flowers and their foliage make an impact in the landscape. Lamium is in the mint family (Lamiaceae), which provides a hint as to its toughness.
This plant can be invasive, depending on where you live. Check with your local county extension for any warnings that they may issue for your own region.