64 GARDENING FOB PLEASURE. 



scriptions of varieties, reference may be made to the cat- 

 alogues. The necessity for this difference in temperature 

 is not absolute, as many plants will do partially well in 

 either ; but we make this distinction as a guide to those 

 having a choice of temperatures, in order that they may 

 select the plants that are best adapted to the one at com- 

 mand. In a greenhouse, particularly if heated by a flue, 

 there is often a difference of five or ten degrees between 

 one end and the other ; in such a case the plants named 

 in the first class must be placed at the cool end, and those 

 of the second class at the other. 



One of the most troublesome pests of plants grown in 

 the greenhouse, or sitting-room, in winter, is the aphis, 

 or " green fly/ 5 as it is termed ; we have no difficulty in 

 getting rid of it in the greenhouse, when it is separate 

 from the house ; all that is necessary is to get some to- 

 bacco stems (such as are thrown out as refuse by cigar 

 makers), and soak them in water for a minute or two ; 

 about half a pound or so for a greenhouse 25 x 20 feet is 

 placed over a small handful of shavings, only enough to 

 light the dampened tobacco, as too many might injure 

 the plants by smoke ; the burned tobacco stems give out 

 a smoke that is quickly fatal to the "green fly." To 

 thoroughly prevent the least appearance of this insect, the 

 greenhouse must be fumigated every four or five days. 

 We fumigate all our greenhouses twice each week during 

 the entire year ; our rule being that an aphis must never 

 be seen upon any plant in the houses. If the greenhouse 

 is attached to the dwelling, so that the tobacco smoke 

 would find its way into the rooms, recourse may be had 

 to another remedy ; take these same waste tobacco stems 

 and steep them in water until the liquid is of the color 

 of strong tea, with this water syringe the plants freely 

 twice a week, this will not only effectually destroy the 

 green fly, but will keep in check most other insects that 

 infest plants. Where only a few plants are kept in 



