80 GARDENING INDOORS AND UNDER GLASS 
The house shrubs, having harder stems and 
tougher leaves than other classes of plants, will stand 
many hardships that to the latter would prove fatal. 
They are, however, particularly susceptible to at- 
tacks of red spider and scale. Keep your shrubs 
clean. If you do not, in spite of their seeming 
immunity to harm, you will have no success with 
them. Syringing, showering, washing, spraying 
with insecticides, even giving a next-to-freezing rest, 
—all the remedies mentioned in Chapter XVII on 
Insects and Diseases — may at times have to be re- 
sorted to. But, at whatever trouble, if you want 
them at all, keep your shrubs clean. 
