COMPUMENTARY 
NEW SERIES VOL. VII 
NO. 16 
ARNOLD ARBORETUM 
HARVARD UNIVERSITY 
BULLETIN 
OF 
POPULAR INFORMATION 
JAMAICA PLAIN. MASS. NOVEMBER 1. 1921 
Conifers, especially Junipers of abnormal form, and dwarf and other 
small growing plants, have not before been planted in such numbers in 
the eastern states, where they are usually crowded together in beds 
without much regard to harmony of arrangement. Such beds of Coni- 
fers are found on each side of the entrance to many suburban and 
other estates, and against the base of houses small and large. The plants 
in these little plantations are attacked by numerous disfiguring insects 
and must often be changed, and, as is always the case in mixed planta- 
tions, some of the plants grow more rapidly than others and eventually 
destroy their weaker neighbors. 
The statement that the climate of eastern North America is not 
adapted to the successful growth of Conifers is shown by the collection 
of these plants in the Arboretum which is believed to be the richest 
in the United States. There are now recognized twenty-eight genera 
of Conifers. Representatives of only fourteen or one-half are in the 
Arboretum collection and several of these are kept alive with difficulty. 
These genera are all of the Northern Hemisphere. No tree of the six 
genera which are found south of the equator is hardy at the north in 
our eastern states. The Japanese Thujopsis has never grown in the 
Arboretum, in which four genera of southern China, Glyptostrobus, Ket- 
eleeria, Taiwania and Fokienia will always be unrepresented. More 
serious is our inability to grow here successfully some of the most im- 
portant Conifers of western America, for the Sequoias, and no species 
of Cupressus are hardy here; the western Tsugas and Chamaecyparis 
are kept alive here with difficulty; the beautiful Abies venusta cannot 
survive a single New England winter, and the noblest Fir-trees in the 
61 
