Veronica bachofenii, syn. Veronica grandis, (Heartleaf Speedwell)
Veronica bachofenii, also known as Veronica grandis, came to me by way of a NARGS seed sale last year. I haven't seen it bloom yet, but the foliage is lovely, and all the plants managed to pull through the winter weather, the voles, and even the deer, and that already says a lot for it. It grows from two to three feet tall in full sun to part shade and in regular, well-drained soil. The bright green, heart-shaped foliage is an asset, as well as the purple spires in summer. The photo is not Veronica bachofenii, but it is very close to what I think it will look like. Accurate photo coming when my own bloom. Zones 4-8. (Photo By Stefan.lefnaer (Own work) [CC BY-SA 4.0 (http://creativecommons.org/licenses/by-sa/4.0)], via Wikimedia Commons)
Veronica spicata "Romiley Purple" (Speedwell)
This lovely Veronica in the photo is not technically "Romiley Purple," but it is a purple Veronica spicata and the best I could come up with until mine bloom. By the way, the photo is by Stan Shebs, via Wiki Commons. "Romiley Purple" is popular in Europe but hasn't been seen a lot on this side of the pond. It is mat forming with flower spikes to about 18 inches and violet blooms. From what I hear, it is a blooming machine. It does stop at some point - it has to - when you should be sure to give it a shearing, and if you want to cut some spikes to take inside, do it in the morning before blooms are completely open. Veronica spicata "Romiley Purple" prefers full sun (although some shade is not out of the question), and well-drained soil. It is also low maintenance and, from what I can tell so far, makes a lovely plant with or without the colorful blooms. Zones 4-8. Quarts.