Doesn't look as if you ever got a response to this, but I have noticed in a couple of spots where I have one stalk of darker flowers on my plants this spring. This is Lamium maculatum "Shell Pink," and normally the flowers are just that - but I now see two places where the stalk's flowers have a color I would call fuschia. I wonder if this is due to cross-pollination with someone else's lamium in a darker shade. At any rate, it adds some interest!
I planted these several years ago for erosion control in my front landscaping in a partially shaded Zone 5 spot. They have worked out beautifully. I would call it an "assertive" plant. It grows fast, but can be kept in check by cutting or pulling runners once or twice a year. It does its job very nicely but doesn't want to grow under the drip line of the eaves of my house. Yours looks fantastic!
