Saponaria.
These grow best in a mixture of sandy loam and peat or decayed vegetable soil. The annuals may be sown either in autumn, and wintered in a frame, or in the open in April. The perennials are increased by seed or by division of the root, and young cuttings of the branching species root freely if planted under glass. S. Ocymoides, on account of its trailing nature, and S. Calabrica make fine rock-work plants. The leaves of S. Officinalis, or Soap Plant, if stirred in water form a lather strong enough to remove grease spots. They bloom in June and July. Height, 6 in. to 2 ft.
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