36o THE COMPLETE GARDEN 



Double Flowers: 



Commonly the result of the substitution of brightly coloured 

 petals for stamens or pistils. A perfect double flower has no stamens 

 or pistils, hence is sterile and the plant must be propagated by cuttings. 



Drainage for plants: 



The carrying away of excess water from the soil in which plants are 

 placed. This drainage promotes a deep root system, which aids the 

 plant in surviving periods of drought; it also prevents a soil from 

 becoming water-soaked and "drowning" the root system, especially 

 of newly transplanted stock. 



Dry Wall: 



A wall constructed of individual stones with loam filling the crevices 

 between them. Such a wall may be used either as a retaining wall 

 to support an embankment of earth or against an earth slope to pre- 

 vent unnecessary erosion. 



Ericaceous: 



A family of plants which require for their normal growth an acid soil 

 (a soil free from lime or magnesium). 



Establish: 



The act of transplanting any plant to a new location and causing root 

 growth which makes the plant as capable in its new location as in its 

 old location, of continuing normal growth. 



Evergreen: 



Plants with persistent leaves. These plants drop but a small portion 

 of the old leaves each year, and may be conifers, broad-leaved ever- 

 greens, or opposite-leaved evergreens. 



Excurrent: 



Having a main stem extending up through the top of the plant. 



Fertilizer: 



Plant food, either directly available, or which upon nitrification will 

 be available for use by the plant. Many fertilizers (such as sheep 

 manure and dried blood) contain plant food in an immediately soluble 

 form for plant requirements or in a form (such as bone meal and lime 

 rock) which does not become available until after a period of chemical i 

 reaction. 



