HERBACEOUS FLOWERING PLANTS IN POTS 39 



certain to become infested with greenfly, and, if they are not 

 to be spoiled, they must be frequently sprayed with an 



Fig. 16. — Chrysanthemum frutescens cut down to induce young 

 shoots to grow from the Vjase. A shoot prepared as a cutting. 



insecticide. Vaporisation is more effective, but requires a 

 greenhouse or a frame ; in a room it is impossible. As 

 cinerarias deteriorate after their first year, they are often 

 treated as annuals. If they are wanted for a second year, 



