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As a general rule I am not fond of plants which disappear completely after flowering. If by chance the label disappears there is danger of damaging them with a fork. Also it is very easy to plant something else where they are growing.

There is one periwinkle which will flower all through the winter if it is given a good position and if the weather is kind. Sometimes V. acutiloba is sold for V. difformis, but the true plant, which comes from south-west Europe, has pale slaty-blue flowers and neat, medium-sized leaves.