Posted: 20/07/2013 at 00:10
Both white and red valerian....well, pink one too...are very invasive plants and not really suitable for the garden. They grow wild on the Towans behind me. People often dig pieces up to plant in their gardens only to later rue the day they did. Roots go deep and wide.
Coimcidentally, at a hospital visit today white valerian was growing in an enclosed area and was about 5' tall.