I^LOWERING SHRUBS IN POTS 65 



not exposed to the sunshine. They must be kept watered. 

 In October they may be brought inside again. 



Syringa (Lilac). — The proper name of the plant 

 popularly known as the syringa is Philadelphus ; the real 

 syringa is what is commonly called the lilac. It is im- 

 portant to remember this when ordering from a nurseryman. 

 There are many fine varieties — Alba grandiflora (large white, 

 single), Alphonse Lavallee (blue, double), Charles X. (large 

 purple, single), Lemoinei (pale lilac, double), and others. 

 They can be forced into flower considerably before their 

 usual time, and the process is helped by immersing the 

 plants (the branches, not the roots) for a few minutes in 

 hot water. When forced, the coloured varieties usually 

 produce white flowers. This always happens if they are 

 grown in the dark. After having been forced, lilacs should 

 be planted outside for a couple of years before they are 

 potted again, and even when they are not subjected to 

 artificial heat it is better to put them outside after flowering. 

 They can be propagated by cuttings or, unless they are 

 grafted, by suckers, which are often numerous. Several 

 fungoid diseases sometimes cause spots on the leaves, but 

 they are not serious. The whitish marks, not infrequently 

 seen on them, are due to the grubs of a tiny moth which 

 tunnel inside the leaves in the same way as those of the 

 chrysanthemum fly. Such leaves should be taken off and 

 burned. Pruning should be confined to trimming out young 

 shoots likely to crowd one another, and the removal of 

 suckers. 



