Sunflower 



( 373 ) 



Swartzia 



sulphur dusted upon shouts and leaves affected 

 witli parasitic fungi (e.y. mildews) is effective in 

 checking the progress of the pest. A small hand 

 bellows or distributor should be used in dusting 

 the affected parts. A little flowers of sulphur 

 placed in the water with which pot Koses and 

 Vines are syringed is an excellent preventive 

 against mildew, and not a few eminent growers 

 put this method into practice. Sulphur may also 

 be worked into winter dressings for Vines and 

 other fruit trees, in company with petroleum, 

 Gishurst Compound, etc. Burning flowers of sul- 

 phur in Melon and Cucumber houses speedily rids 

 them of lurking insect and fungoid pests, and is to 

 be recommended, but it is deadly to growing 

 plants. (See also FUNGICIDES and FUMIGATIXC.) 



SUNFLOWER (*ee HELIAN- 

 THUS). 



SUPERPHOSPHATES. 



Superphosphates, either mineral or bone, con- 

 stitute one of the most valuable "artificial " plant 

 foods, as there is scarcely a crop to which they 

 will not prove beneficial. " Super," as it is com- 

 monly termed, can be applied at practically any 

 period of the year, but generally speaking it proves 

 moM valuable when applied early in spring. It 

 is the base of the majority of the specially mixed 

 manures, and is included in all mixtures recom- 

 mended for kitchen garden crops. Whatever form 

 of super is employed, it must be remembered 

 that its whole value lies in the amount of soluble 

 phosphate, and that which gives the highest guar- 

 anteed percentage will be the cheapest. Mineral 

 superphosphate is most commonly used, and it 

 should be received in a dry condition. The 

 amount, of application varies to a degree upon 

 the different soils and the various crops, but for a 

 spring dressing, to be worked into soil in which 

 there is a known deficiency of lime, 7 Ib. per 

 square rod may be advantageously given. The 

 super should be kept from the leaves of the 

 plants, or they are liable to become burned. (For 

 the use of super in association with other manures, 

 c the various fruit and vegetable garden crops ; 

 also ARTIFICIALS.) 



SUSUM. 



The only notable member of this genus (ord. 

 Flai;ellariea?)isanthehiiintliieum, whose little horti- 

 cultural value lies in the Dracasna-like. reddish 

 leafage. Stove treatment and well-drained loam 

 are essential. 



SUTHERLANDIA. 



Half-hardy or greenhouse shrubs (ord. Legumin- 

 osae). Propagation, by seeds, or cuttings of young 

 shoots. Light, loamy soil. 



Principal Species : 

 frutescens(?),3'to 5', Je., Senna. Canescens ami 



si'. (*.'/. Colutea frut- obcordata are vars. 



escens). Cape Bladder 



!<nma<-k (gee liliiix). 



!<n in HUT Smrf!nJie (sec Leunyiim lestinim). 



ff imden- (see Drosrra). 



ttinifriiit (see Jfelioaar/ntii), 



i*u plant (sec Pnrtiilaca ijrandi flora). 



Siiiirnsr (sir Ifi-liimt/iemum). 



,s'w/ rhi m (st'r Si/nr/ihiixlrlllirn). 



ffnti-rn (nf Jlntli. SIT ('//,/ i/n.t/(ima). 



ffineiirroir If lit (nee C'aryoear). 



SWAINSONA. 



Evergreen shrubs or sub-shrubs (ord. Legumin- 

 osse), growing best in the greenhouse. There are 

 several species, but very few are of acknowledged 

 horticultural value. Propagation, . by cuttings be- 

 neath a bell-glass in summer, or by seeds sown 

 when ripe or in spring after being soaked. Soil, 

 .three parts of fibrous loam and one part of fibwms 

 peat, with coarse sand. 



Principal Species and Varieties : 

 coronillifolia, 4', Jy. , light - galegscfolia alba, 6', 



rosy pur. (syn. OslK>rnii). sum., pure wh. 



galega'folia, 6', sum., 



deep reddish pur. 



greyana, 3', Jy. , pk. 



Photo : Cafurll ,( Cmnpimil, Ltd. 



SWEET PEA Miss WII.LMOTT (*r ;>. 375). 



Other Species : 



canescens, 2', Je., vio. Iessertia;folia, 2', Jy.,pur. 



pur. (tyii. Cyclogyne procumbens, 1', sum., pur. 

 canescens). C-fy- vnolacea). 



SVTARTZIA. 



Evergreen stove shrubs (ord. Leguminosa?). Prop- 

 agation, by cuttings of half-ripened wood, in very 



(sir AsrUiriax and, C/ielidmiium). 

 Srrammerilinii'tu (r /fi'/ic/iri/xinii). 

 f^n-amp Doijtrmid (Itelea trifnliata). 

 Snamp JRrkory (Carya ammo). 



