Hello, I have three purple salvia, planted next to the house that come up every spring, with great healthy flowers, get a little over two feel tall with the flowers. However by early June the flowers all brown out and I cannot ever get them to reflower in season. I cut the flower section down buy they do not grow up again. I notice salvias flourishing elsewhere into the summer near my neighborhood. Could it be the species itself, maybe they don't like being next to the house, some other secret? Thanks