P. comosum, sometimes called the horned rampion, is an unusual rockery plant beloved of slugs, but not difficult to grow. It prefers a limy soil, perfect drainage and does best when planted in a rock crevice filled with loamy soil and mortar rubble. It grows to about 3 in. with a spread of about 9 in. when well established. The foliage is a dark, glossy green and the bluish-violet flowers have a curious beaked appearance. They appear in early summer. Increase by seed sown in a cold frame in spring.

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