EVERGREENS 



in 



it is essential during the cooler hours of the day, and at frequent in 

 tervals, to spray these plants to wash off much of the soot which col- 

 lects from the atmosphere. While the leaves of evergreens are 

 heavily covered with a layer of cuticle, the breathing pores are very 

 susceptible to clogging from the dust of a polluted city atmosphere. 



So much for the discussion of the adaptation of evergreens to these 

 conditions. A list of evergreens is shown in Group IX-C, found through 

 experience to be not generally recommended for use in the Middle West. 



Another condition often arises in the use of evergreens. Material 

 is desired for undergrowth planting in shady wooded areas. There 

 are very few kinds of evergreens which will produce anything like their 

 normal density of foliage where they are deprived of a great portion 

 of sunlight. This group of material is shown in Group IX-D. 



It is often necessary to use groups of low-growing and refined types 

 of evergreens to provide mass effects on private lawns and about 

 residences, to be of value during the winter and summer months. 

 A list of evergreens available and adapted to this use has been generally 

 outlined. They must be of the more slow-growing types if over- 

 crowding within the first two or three years after transplanting is to 

 be avoided. 



LIST OF EVERGREENS 



A. MOST HARDY. This group contains types of evergreens 

 selected for general use under widely varied conditions throughout 

 the northeastern section of the United States. 



Abies brachyphylla 



Nikko Fir 

 Abies concolor 



White Fir 

 Abies veitchi 



Veitch's Silver Fir 

 Chamaecyparis obtusa 



Japanese Cypress 

 Juniperus chinensis pfitzeriana 



Pfitzer's Juniper 

 Juniperus communis 

 Common Juniper 

 Juniperus communis aurea 



Golden Juniper 

 Juniperus excelsa stricta 

 Slender Greek Juniper 

 Juniperus horizpntalis 

 Trailing Juniper 



Juniperus horizontalis douglasi 



Waukegan Juniper 

 Juniperus sabina 



Savin Juniper 

 Juniperus scopulorum 



Rocky Mountain Silver Cedar 

 Juniperus virginiana 



Red Cedar 

 Juniperus virginiana cannarti 



Columnar Tufted Cedar 

 Juniperus virginiana schotti 



Schott's Red Cedar 

 Picea alba 



White Spruce 

 Picea alcockiana 



Alcock's Spruce 

 Picea engelmanni 



Engelmann's Spruce 



