Hardy perennial plants, the taller species being cultivated in the borders and the dwarf kinds in the rock garden. They are very valuable as cut flowers.
Plant in autumn or spring in an ordinary soil with an addition of old mortar rubble. They like a well-drained sunny situation. Cut down in October. Increase by cuttings and division of roots. Seeds may also be sown outdoors in April, transplanting to their flowering position in June or July.
The best for the amateurs garden are: 0. cerastioides, white with red veins. May-June. 0. dubia, pale rose with purple stems. May-September.
G. repens, white flowers all summer. Trailing habit.