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This evergreen forms a mat of foliage and is set against bright blue flowers. Like others though, it flowers in spring and summer. It prefers acidic soil so it might need to be planted in a container and then buried in your trough if you have more than one in the same space. These will reach full heights of 20cm but they can spread prolifically. If grown in containers they do need to be watered more often than most other rockery plants as they hate to be dry but they dislike being stood in water.