18 



EUCALYPTS IN FLORIDA. 



with an underlying limestone which comes very near the surface, it 

 made rather poor growth, but at Avon Park on deep sandy soils it 

 has done well and resisted all the cold weather for the last 10 years, 

 or a minimum temperature of about 20° F. 



Table 6. — Eucalyptus crebra in Florida. 





Age. 



Height. 



Diameter 

 breast- 

 high. 



Average annual 

 growth. 



Killed 



back by 



frost/ 



Temper- 

 ature. 





Location. 



Height. 



Diameter 

 breast- 

 high. 



Soil. 



Miami 



Years, i Feet. 



Inches. 

 7.0 



4.5 



4.0 

 12.6 



17.0 



10.5 



Feet. 

 6.3 



3.3 



4.1 

 3.0 

 3.5 



3.0 



Inches. 

 1.8 



.7 



.7 

 1.3 

 1.7 



1.1 







Low pine land., 

 rock n«ar sur- 

 face. 



Subtropical 

 Garden, Mi- 

 ami. 



Do 



6 



6 

 8 



20 



25 

 35 

 35 











Limestone. 



Avon Park 



No 





Sandv, deep. 

 Do. 



Do 



8 



No 





Do 1 



Xo 





Do. 













Its occurrence at Miami and at Avon Park shows that E. crebra 

 is adapted to a fairly wide range of climatic conditions. It may be 

 possible that on suitable soils this species can be grown through the 

 central lake region, probably as far north as Eustis, since it has been 

 reported to withstand temperatures as low as 18°. For the present, 

 however, it may not be advisable to extend its range beyond the 

 localities where the temperature is apt to fall below 20° for any long 

 period of time. 



The narrow-leaved ironbark is a tree of moderate size. It reaches 

 a height of about 90 feet and a maximum diameter of about 3 feet. 

 Its growth is most rapid during the first few years and becomes 

 slower as the tree grows older. In Brazil, in plantations of the 

 Paulista Railroad, trees of this species attained in five years a height 

 of 25 feet and a diameter of about 3 inches. Trees 2 years old 

 have a height of 1 feet. It grows on very poor soils, provided they 

 are not moist or damp, but it can not withstand water in the ground. 



EUCALYPTUS GLOBULUS LABILL (BLUE GUM). 



Blue gum, possibly the best known species of eucalyptus, has been 

 extensively planted in southern California and in practically every 

 country into which eucalyptus has been introduced. As a matter of 

 fact, for 20 years it was the only species which was generally planted 

 throughout the world, yet in Florida the blue gum has so far met 

 with little success, though it was one of the first species tried. This 

 failure may be traced in many cases directly to its being planted out- 

 side of its climatic range. It is a tree which, for the first year, is 

 especially sensitive to frost. Seedlings can scarcely endure tern- 



