SEEDS 55 



tips of germinating seedlings. By proper precaution, all such 

 injury may be prevented. 



(7) The results obtained to date show that it is entirely possible 

 and practicable to control damping-off by soil disinfection. Un- 

 fortunately, the varying behavior of disinfectants at different places 

 renders it impossible to recommend any single treatment which 

 will be everywhere successful. 



BROAD LEAVED EVERGREENS 



Rhododendrons (p. 210), Kalmias (p. 199), Andromedas (p. 183), 

 Gallunas (ps. 174, 187), Ericas (p. 69), and Azaleas (p. 183), are best 

 sown in a mixture of peat and sandy loam over which is placed a thin 

 layer of screened sphagnum moss. The seed is sown on the moss 

 and covered by glass. A temperature of about 55 degrees should 

 be maintained. 



Wheii th6 seedlings attain some size they are transplanted to 

 frames out of doors and in the Winter given shading and protection. 



DICECIOUS PLANTS 



The following plants have the two sexes on separate plants, 

 and are called dioecious. Unless both sorts of plants are in close 

 proximity no seeds nor fruits are produced. 



Ailanthus. Male flowers have objectionable odor; only female trees 

 should be propagated. 



Aucuba. The female flowers should be fertilized with a camel's hair 

 brush. The charm of the plants is heightened by the attractive 

 red berries. 



Broussonetia. Male plants produce flowers in pendulous catkins, 

 greenish in color; female plants produce the flowers in globular 

 heads, showing purplish hairs until August, when the surface be- 

 comes dotted with orange pustules a quarter of an inch long. 



Cercidiphyllum. Both male and female flowers are very small; 

 inconspicuous. The female tree is more beautiful, being very 

 spreading; the male is columnar, according to F. Canning. 



Chionanthus. Only certain plants bear fruits. 



Cycas. The male flower is a cone-like structure; female flowers are 

 clusters of modified leaves. (See figs. 9 and 10.) 



Elaeagnus. Certain bushes are sterile, although the flowers bear both 

 sexes. 



Garrya elliptica. Greenish white male catkins; ornamental. Black 

 berries are also showy. 



Ginkgo. Male trees only should be propagated; female fruits smell 

 badly. 



Hippophae. Without both sexes planted together, the beautiful fruit 

 display is lost. 



