I purchased lavendar from Springhill and had great success with them. That was on a slight slope along side both sides of a sidewalk. They bloomed the first year and every year since.The slope probably helped since books say "likes well drained soils."
I ordered three of these lavender plants, and two of the arrived wilted and half-dead. Unsurprisingly, they didn't survive even though I did plant them and try to keep them alive. The other plan did survive, but growth has been very slow and no flowers yet. We'll see what this spring and summer bring with that one.