220 THE FLOWER GARDEN. 
surfaces or forming edgings merely dibble in rooted portions 
a few inches apart, and then the space will soon be covered. 
To establish plants on walls prepare a mixture of fresh cow 
dung and clay, and use some of this to fix the plants in the 
crevices. The taller kinds, which may be grown on rockeries 
or in borders, are as follows : S. aizoon, flowers yellow, Aug. ; 
i ft. ; Siberia. S. kamtschaticum, flowers yellow, Sept. ; 6in. ; 
Kamtschatka. S. Maximowiczi, flowers yellow, July; i8in. ; 
Siberia. S. maximum, flowers white, spotted red, Sept. ; 2ft. ; 
Europe. S. populifolium, flowers pink and white, with purple 
stamens, Aug. ; i8in. ; N. America. S. roseum (Syn. S. rho- 
diola), flowers yellow or purplish, summer; 6 to min. ; Britain. 
S. Sieboldii, flowers pinkish, Aug. ; stems trailing ; Japan. S. 
Sieboldii variegatum is a variegated variety, with a creamy- 
white blotch on each leaf. Both hardy only in warm districts. 
S. spectabile, flowers pink, Sept. ; 1 to 2ft. ; Japan. A showy 
species, one of the best. S. Telephium, flowers rosy-white, 
July; 12 to 1 Sin. ; Britain. The species just referred 
to will thrive in ordinary soils in sunny positions. S. spec- 
tabile, in fact, will do well in shade, and is a bright autumn- 
flowering plant. Plant in autumn or spring. All are readily 
increased by seeds sown outdoors in April ; by cuttings dibbled 
in the open border in summer or autumn ; also by division 
in autumn or spring. S. sarmentosum (Syn. S. carneum 
variegatum) is a pretty, tender, Chinese species, with leaves 
edged with white and pink stems. It grows about 3m. high, 
and is specially suitable for carpet bedding in summer. The 
plants require to be protected in a heated greenhouse in 
winter and planted out in May. All are easily increased by 
cuttings or division. 
Sempervivum (Houseleek). — Hardy, fleshy-leaved 
perennials, with leaves arranged in rosette form, and adapted 
for edgings to beds and borders, or growing in crevices or 
beds of the rockery. Nat. Ord. Crassulaceae. The Common 
Native Houseleek (S. Tectorum), leaves green, tipped reddish- 
brown ; S. calcareum (Glaucous Houseleek), leaves blue-green, 
tipped crimson-brown, Alps ; and S. montanum (Mountain 
Houseleek), leaves downy, Pyrenees; are three species largely 
used as edgings to summer beds. They also make good 
permanent edgings to border. May also be grown in the 
crevices of rockeries. Ordinary soil, mixed with a little 
mortar or brick rubbish, will be a suitable compost. ,S. tabula:- 
forme is a tender species, with leaves so growing as to form a 
flat green disc. This is used largely as an edging to carpet 
beds. Requires to be protected in a greenhouse in winter and 
planted out in May. The other species of Houseleek are as 
