HEIGHT GROWTH 



91 



(2) The Relative Height Growth. 



This is a very important matter indeed when con- 

 templating planting a mixture. It is necessary to know 

 not only the ultimate height growth of the different species 

 of trees, but also the relative height growth of the trees when 

 young. 



The fastest growing trees when young, and up to about 

 15 years of age, are, more or less, in the following order, 

 provided that the soil and locality suit each tree : 



CLASS I. < 



CLASS II. H 



'Douglas Fir. 

 Cupressus macro- 



carpa. 

 Poplars. 

 Tree Willows. 

 Sitka Spruce. 

 Birch. 



Norway Maple. 

 Sycamore. 



/^Japanese Larch. 



Corsican Pine. 



Austrian Pine. 



Alder. 



Ash (F. Oregond}. 



Ash (F. Americana], 



Ash (European). 



Weymouth Pine. 



European Larch. 

 '^Scots Pine. 



CLASS III/ 



CLASS IV.- 



Lime. 



Elm. 



Thuya gigantea. 



Spanish Chestnut. 



Norway Spruce. 



Hornbeam. 



Beech. 



Oak (Sessile). 



Oak (Pedunculate). 



CLASS V. 



/Silver Fir. 

 I Yew. 



their 



Now, with reference to the above : 



Poplars, Willows, and Birch very soon attain 

 principal height growth, in from 20 to 30 years. 



Norway Spruce when about 8 years old, and Silver 

 Fir when about 16 years old, begin to grow very quickly, 

 and continue this rapid height growth until their principal 

 height growth is attained. 



Japanese Larch when about 20 years of age will usually 

 be caught up by the European Larch. 



Beech begins to grow fairly rapidly when about 20 years 

 of age, if the canopy be close. 



