Name this plant . . . please!

I bought this beautiful plant at the Home Depot, mainly because it cost (costed? did cost? was in the act of costing?) I paid $6.00 for it. I feel like a plant that is lush and lovely and purple and costs six bucks is a plant that is meant for me.

But I don't really know what it is. It was out with the mums (a plant that annoys me because I find it all smug and "I get worn by the Homecoming Queen -- nyah, nyah, nyah!") so I assume this purple beauty is a fall-ish plant. Or maybe it's a spring plant that originally cost (costed?) thirty-five dollars. I haven't the foggiest notion.

It was gorgeous in the rain on Saturday, but a) I don't have the camera savvy to take a picture that captures its glamour, and b) it was raining, dudes! There's only so much I am willing to go through for my art.

Ominous information I feel compelled to report -- I tend to kill the beautiful plants. At the beginning of the summer this planter held this whitish silvery thing (What is it? Don't know.) and some English lavender. The ivy is, I feel, a weed and should be ignored. The silvery thing has not changed a bit. It hasn't grown; it hasn't wilted. And I have not done One. Thing. For. It. Clearly silvery plants can take this kind of treatment, but English lavender? Not so much.