Encyclopaedia of Gardening 171 



also prepared with a slice and a cut (upward and downward in this 

 case, however), the two are fitted together, tied, and waxed. 



Indoor grafting. This is the work of expert propagators in nur- 

 series, and is rarely done outside the trade establishments. The 

 process adopted is generally called " saddle " grafting. The stock 

 is cut upwards on two sides, forming a ridge, and the graft is slit up 

 the centre so that it can be pressed gently on to the ridge or saddle 

 and tied. Bottom heat is desirable. 



Grape. See Fruit. 



Grape Hyacinth. See Bulbs Hyacinth. 

 Grass. See Flower Garden and Lawn. 

 Grasses, Ornamental. See Annuals. 

 Green Fly. See Aphides. 



Greenhouse. With the aid of a greenhouse, heated or unheated, 

 many plants may be grown which have to be omitted where there 

 is no glass, and flowers can be produced at periods of the year when 

 they would have to be procured by purchase or done without if there 

 was no plant structure available. Greenhouses, therefore, are a 

 useful auxiliary to the garden. At the same time, they entail addi- 

 tional expense and responsibility, and these things should be con- 

 sidered. Greenhouses are of many shapes and sizes, and they are 

 devoted to various purposes; but in large establishments, where 

 there are several different glass structures, " greenhouse " has a 

 specific meaning. It is not a " stove," an " intermediate house," a 

 "pit," or a "conservatory;" it is "the greenhouse" a mildly 

 heated house, used mainly for bringing on young plants which are 

 to be flowered in a conservatory. With amateurs of limited means, 

 however, the greenhouse is a general structure, in which all kinds of 

 plants are grown, and which is used for flowering mature plants as 

 well as bringing on young ones. 



Forms of greenhouse. A greenhouse may have a single roof, lean- 

 ing against a wall or other support; or it may have a " span " roof, 

 each side supporting the other against a ridge-board. Against a 

 low wall it may rise, make a short dip, and rise again to the wall, 

 forming a " hip." A plain span or lean-to is better than a com- 

 pound structure for amateurs. 



Materials. The greenhouse should . consist of well-seasoned 

 timber, painted 4 coats, and glazed with 2i-oz. glass without 

 putty. It should be well supplied with ventilators. In a span roof 

 there should be at least one ventilator on each side. If the structure 

 is to be movable it should be made in sections to rest on loose bricks, 

 and fixed to the wall with screws turned into blocks. In the case of 

 a freehold owner the house may rest on mortared brick walls. 



Urban building laws. In districts where urban building laws 

 apply, a person may not erect a greenhouse of any kind before sub- 

 mitting plans to the corporation, district council, or other authority. 



Unheated greenhouses. It will not be possible to get bloom all 

 the year round from an unheated house by growing the ordinary 



