Perennials for a Thought-out Garden 229 



for cutting. One of the very best almost hardy plants. Give 

 light protection in winter. Sow outdoors in May, or for spring bloom 

 in frames in February. Can be forced and propagated from cuttings 

 at all seasons. 

 *SNEEZEWEED. See NATIVE PLANTS, p. 94. 



SNEEZEWORT (Acbillea Ptarmica, fl.-pL). White, button-like flowers in 

 loose corymbs all summer; I to 2 feet. One of the most useful 

 white flowers for cutting. Much like the yarrow, with finely cut 

 leaves. Perfectly hardy, 



SPANISH BAYONET, ADAM S NEEDLE (Yucca filamentosa). Creamy 

 white. June, July; ultimate height, 6 feet. Best desert plant 

 for garden use. Bold, rigid foliage, 2 to 2^ feet, in dense rosettes. 

 Flowers borne in towering spike, after which the old plant makes 

 offsets. Good for massing and sub-tropical effects. 



*SPIDERWORT (Tradescantia Virginiand). Blue, violet. All summer; 

 2 feet. Carpeting plant with rich green foliage that endures all the 

 season. Invaluable for shaded and poor, wet soils, and for fore 

 ground to shrubbery. Also grows in dry soils. Various colour 

 varieties in cultivation. 



SPIREA (Astilbe Japonica). White. June, July; ij feet. Feathery 

 plumes borne above finely cut foliage. The florist s spirea, 

 forced for winter. See also SHRUBS, p. 185. 



STORE S ASTER (Stokesia cyanea). Blue, white. August to October; i J 

 feet. Large, flat, thistle-like flowers, 2 inches across. Weil- 

 drained, deep soil. The white variety quite new. Propagate by 

 seeds in frames. 



SUNFLOWER, MAXIMILIAN S (Helianthus Maximiliani). Deep yellow. 

 October, November; 8 feet. Leaves deeply grooved. Flowers ij 

 inches. Latest of all the tall perennials, and will endure severe 



frosts; any soil. , SLENDER (H. orgyalis). September; 4 



feet long. Pale yellow flowers above drooping leaves, 10 to 12 



feet. , DOUBLE PERENNIAL (H. multiflorus, var. plenus). 



August; 4 feet. Flowers 4 inches across, symmetrical. Best large, 

 double flower of any perennial. Rich soil. Divide every four 

 years. 



SWEET WILLIAM (Dianthus barbatus). Maroon, red, pink, white. 

 Self-coloured, variegated. Trusses 4 inches across ; fragrant, showy; 



