THE NURSERY-LIST 287 



Collinsia. Scrophulariacca. 



Propagated by seeds sown in the fall outdoors in well-drained 

 soil and protected over winter; may also be sown in spring for 

 later bloom. 



Colocasia. Araceoe. 



Propagation as for caladium, by offsets of the tubers or " bulbs." 

 Taro is the tuberous roots of C. antiquorum or C. esculenta. Dasheen 

 is another form. Consult Caladium, page 265. 



Colutea (Bladder Senna). Leguminosce. 



Multiplied by seeds sown in spring, and by cuttings in sandy soil 

 in autumn. Rare kinds are sometimes grafted on C. arborescens 

 in spring under glass. 



Comfrey: Symphytum. 



Commelina. Commelinacece. 



Grown from seeds sown in a frame early in April; also by 

 cuttings, which will root in sand, in a gentle hotbed, in March or 

 April. Sometimes propagated by division of the tubers. 



Comptonia (Comptonia asplenifolia) . Sweet Fern. Myricacece. 



Propagated by seeds, by dividing the clumps, and by layers. By 

 some botanists, this interesting native plant is included in Myrica, 

 as M. asplenifolia. 



Conifers. Conifer. 



When procurable, seeds are the readiest means of propagating 

 all the cone-bearing family. Cuttings or grafts are employed when 

 seeds are not obtainable and for forms or varieties that do not come 

 true from seeds or of which seeds cannot be obtained. See Chamas- 

 cyparis, Thuja and others. Cuttings usually root readily. 



Seeds are gathered as soon as ripe. The cones of some species, 

 as the white pine and the firs, empty themselves of seeds very early 

 and the cones must be taken before they open. Of some species the 

 cones remain closed for years, and they are opened by roasting them 

 in ovens, care being taken that the seeds are not injured by the 

 heat. Seeds of conifers are kept in tight boxes or bags in a cool 

 dry room and sown in spring in a carefully prepared seed-bed; 

 take care not to have the bed too wet. 



Seeds of some of the soft-fruited kinds, as the junipers and 

 yews, should be macerated and then cleaned by rubbing in sand. 

 Often these seeds lie a year before germinating. 



