P. Santolina chamaecyparissus (incana) is a dwarf evergreen shrub to about 18 in. which prefers a dry soil. The bright, yellow, button-likeappear in July. The aromatic silvery-grey foliage is distinct and makes a useful foil to other border plants. (Though a shrub it looks well in the herbaceous border.) S. c. nana is a more compact form growing to about 1 ft. The type plant is cut back occasionally after flowering as it is inclined to develop an untidy habit of growth. Increase by division in early autumn. S. neapolitana (rosmarinifolia) is a taller species with rather longer, more finely divided .
SAPONARIA or SOAPWORT. Saponaria ocymoides is a sprawling perennial for rock gardens or dry walls. The deep rose or whiteare very freely produced in late summer. Well-drained, light to medium soil is best. S. lutea has creamy-yellow flowers in May and June on 2 in. plants and S. caespitosa is a warm magenta, a little taller to about 4 in., flowering in spring. All these are increased by division or in spring. S. officinalis fore pie no is the double form of the old-fashioned Bouncing Bet, often found in cottage gardens. The slightly fragrant, salmon-pink flowers appear on an 18 in. plant in late summer. Also increased by division in spring.