78 THE BOOK OF THE GREENHOUSE 



lime rubble, and a sprinkling of crushed bone. Pot 

 firmly and in well-drained pots. Well managed roses 

 will go on in the same pots for some years, provided that 

 much of the old soil is removed and replaced by fresh 

 material each autumn, so that an annual repotting is 

 unnecessary when they reach eight-inch and nine-inch 

 pots. Roses are well known to be subject to green fly 

 out of doors. Both this troublesome pest, and red spider 

 also, will attack them under glass and must be given no 

 quarter. The last named insect only troubles plants 

 that have been grown in too dry an atmosphere. 



Salvia splendens. Other Salvias than this are good 

 greenhouse plants, but the best form (S. splendens grandi- 

 flora) of the one named is by far the finest of all for pot 

 work and gives a grand display of brilliant colour late in 

 autumn, when brightness is most needed. It may be pro- 

 pagated in spring either from young shoots made into 

 cuttings and struck on a hot-bed, or from seeds saved 

 from a good plant and raised in heat. The young plants 

 are quick growing and must be kept on the move by 

 repotting as often as necessary, using a mixture in which 

 loam forms one-half, the other half being composed of 

 equal portions of leaf mould, decayed animal manure, and 

 sand. The final sized pots may be anything from eight 

 inches to eleven inches according to the size of plant re- 

 quired. When danger from frost is over, put the plants 

 out of doors in a semi-shaded position, not overhung by 

 trees, and, when they have grown about two feet high, 

 pinch out the tops and allow all the side branches to 

 develop at will. Before frost comes, remove again to the 

 greenhouse where they are to flower. A temperature of 

 50 deg.to 55 deg. will hold them in flower for a long while, 

 and, if the proper variety has been grown, the calyces will 

 remain bright for weeks after the flowers have dropped. 

 This plant is not much subject to insects, but red spider 

 sometimes gets on plants allowed to become too dry 



