34 



Green ash, Carolina poplar, 



Red oak, Niobe willow, 



Scarlet oak, Golden willow, 



European birch, Russian olive. 

 Hackberry, 



EVERGREENS. 



(For full information concerning evergreens, consult Bulletin 90 of the 

 Iowa Experiment Station.) 



Douglas spruce, White pine, 



Norway spruce, Austrian pine, 



European larch, Dwarf mountain pine, 



Silver fir, Scotch pine, 



Red cedar. filue spruce, 

 White spruce, 



SHRUBS. 



High bush cranberry, Mock Orange. 



Snowball, Bridal wreath, 



Juneberry, Nine-bark, 



Bush honey-suckle, Japanese lilac, 



Siberian dogwood. French lilac, 



ORNAMENTAL HEDGE PLANTS. 

 Hawthorn, Dwarf barberry, 



Buckthorn, Common barberry, 



Polish privet. Purple-leaf barberry, 



Amour barberry, 



VINES. 



Clematis jackmanii, Boston ivy, 



Clematis paniculata, Engelman ivy, 



Trumpet honey-suckle. Bitter sweet, 



TRIMMING TREES. 



The climate of our state is more or less severe upon tree life of 

 all kinds. Trees are frequently injured by the splitting down of 

 the branches due to sleet-storms and severe winds. This condition 

 requires pruning to insure the proper healing over of the wound, 

 otherwise decay enters in and the life of the tree may be seri- 

 ously shortened. In removing injured branches, particular pains 

 should be taken to make the cut up close to the remaining branch 

 and parallel to it. Under these conditions the wound is nour- 

 ished and gradually heals over. Healing does not take place 

 where a stub is left and decay gradually works down into the 

 main stem. For cuts over two inches in diameter the surface 

 should be coated with thick white lead. 



In this connection the practice of topping back large trees, such 

 as the soft maple, should be discouraged. This can in no manner 

 change a soft-wooded tree to a hard-wooded kind and in the 

 majority of instances the central portion of the large stub dies 

 back and decays, leaving only a shell of live bark around the 

 circumference, and in a few years the tree goes to pieces and is 



