Both their flowers and their foliage make an impact on the landscape. Lamium is in the mint family (Lamiaceae), which provides a hint as to its toughness. The spotted dead nettle plant is listed as invasive in the Invasive Plant Atlas of the United States and is located mainly in the upper eastern states. Some leaves may revert back to an all-green color (instead of being variegated); be sure to prune these out, so that the green color does not eventually take over the plant. Being creepers and having a tendency to spread, these classic cottage-garden plants are popular flowering ground covers. They are especially valued for use in shady spots, which is a condition that many plants dislike. The silvery foliage of these shade plants makes them a good fit for landscape designs with creative color schemes. For companion plants, select other shade-lovers. The following could be some of the best choices, depending on your own unique landscaping needs:
Barrenwort (Epimedium) Many Hosta species Lenten rose (Helleborus orientalis)
Their stems root where they touch the soil, allowing the plants to spread. Eventually, they will form a mat. Spotted dead nettles will naturalize in some areas. This is great if you need to cover a problem area with an attractive ground cover, but not so good if you are trying to grow them in a place where you need a well-behaved plant. Thus you need to be careful in choosing the right spot to grow this plant.
Light
Grow spotted dead nettles in full to partial shade. They will not require much water when grown in full shade, a fact that (along with their resistance to deer pests) recommends them to homeowners seeking low-maintenance landscaping. In fact, they are one of the best perennials for shade.
Soil
Install the plants in an acidic, well-drained, loamy soil. Add compost if you have clayey soil to improve drainage.
Water
Spotted dead nettles tolerate even shady areas that have dry soil. This ground cover requires very little care at all if planted in full shade. However, the more sunshine that you give these plants, the more water they will need, since they perform best in evenly moist soil.
Temperature and Humidity
Spotted dead nettle has a wide range, but does not do well in very warm, humid locations.
Fertilizer
Compost should be sufficient, as the plants do not require rich soil. Manure tea is a good substitute when it is too difficult to work more compost into the soil.
Types of Spotted Dead Nettles
A relative of spotted dead nettles is yellow archangel (Lamium galeobdolon). It offers similar value and requires similar conditions. One difference, though, is that it is more aggressive. There are also several cultivars (all cold-hardy to at least zone 4, most 3 to 12 inches tall, and all wanting the sun/soil conditions of the species plant) of L. maculatum, including:
Purple Dragon: Purplish flowers and silver foliage White Nancy: White flowers, silvery leavesBeedham’s White: White flowers, leaves chartreuse and whiteCannon’s Gold: Pink flowers, chartreuse foliageOrchid Frost: Pink-purple flowers; leaves silver in the center and green at the edge; known for its disease-resistanceAnne Greenway: Mauve flowers; green, chartreuse, and silver leavesAureum: Pink flowers; leaves golden on the edge, white in the centerGhost: Light-purple flowers; leaves almost wholly silver; taller (up to 14 inches) than the typical L. maculatum, and even the individual leaves bigger than on most kinds
Spotted Dead Nettles vs. Stinging Nettles
While dead nettle plants are flowering perennials, stinging nettles, by contrast, are noxious weeds (but edible when properly prepared). Stinging nettles also grow quite tall. The unusual common name of “dead nettles” alludes to the fact that, while it resembles stinging nettles, the stingers are dead on L. maculatum, rendering it harmless.
Pruning
Spotted dead nettles should be pruned in the summer after the first blooming period. Cutting the stems or pinching back to a joint will stimulate new growth for the plant. Mature plants that have gotten “leggy” should be cut down to just above the ground, which then will grow back into a bushy, compact plant. Any solid green leaves should be snipped out, otherwise, the plant will eventually lose the variegated leaves and become all green. These plants spread out, and you can keep them under control by pruning, too. Cut them to the height you prefer them to be and thin them out if they’re getting too thick by cutting some of the branches throughout the plant back to the ground.
Propagating Spotted Dead Nettles
Spotted dead nettles propagate easily by themselves from runners, by dividing, or from cuttings. Here’s how: Runners: Dividing: Cuttings: While they can self-seed themselves, spotted dead nettles do not do well if you try to grow them from seed.
Potting Spotted Dead Nettles
Spotted dead nettles are a great plant to put in containers or hanging baskets. Plant them with an assortment of other flowering plants in a container garden to have sitting on your porch and lanai, or they trail beautifully from a hanging basket. Simply put some potting soil mix in a container or hanging basket that has drainage holes, and plant the spotted dead nettle, then water. Keep in mind that smaller containers will require watering more often. Plant it with an assortment of flowering plants, including paperwhites, cyclamen, and coral bells. Whatever you decide to mix it with, remember to select plants that need partial to full shade.
Overwintering
This plant is deciduous in areas where there is colder weather but stays semi-evergreen in other regions. To encourage new growth in the springtime cut spotted dead nettles back after the first frost or in the late autumn, depending on where you live.
Common Pests & Plant Diseases
Spotted dead nettles have few problems in the north; among other good features is the fact that they are deer-resistant plants. In the south, however, they may develop problems with leaf-spotting due to the high humidity. Providing extra spacing between plants can lessen leaf-spotting, but this somewhat defeats the purpose of growing spotted dead nettles, as one of their best features is that they spread and fill in an area, thereby crowding out weeds. Common pests for spotted dead nettles are slugs and snails, which seem to be the main pests for this plant, although aphids can also attach themselves to the stems and leaves.
