THE NURSERY LIST. 171 



Cryptostemma. Composite. 



Propagated by seeds, which should be sown on a gentle 

 hot-bed in early spring. 



Cubeba. See Piper. 



Cucumber {Ctuumis sativus}. Cucurbitacece. 



Seeds. If sown out-doors, the operation should be delayed 

 until the weather is thoroughly settled. 



Cucumber-tree. See Magnolia. 



Cunninghamia (Broad-leaved China Fir). Conifer ce. 



Increased by seeds and cuttings of growing wood. 

 Cuphea. Lythrariece. 



Increased easily by seed ; but cuttings of the perennial 

 sorts strike freely in March or April, in brisk bottom heat. 



Cupressus (Cypress). Conifer ce. 



Seeds may be collected in early spring, and should be sown 

 in April in a warm, friable soil. Cuttings of growing or ma- 

 ture wood, much as for Retinospora, which see. 



CurculigO. Amaryllidece. 



Seeds ; also by suckers, which form at the base of the stem. 



Curcuma (Tumeric). Scitaminece. 

 Increased by root division. 



Currant (Ribes rtibrttm, J\. nigrum and R. aureuni}. Saxifragece. 

 New varieties are grown from seeds, which may be sown in 

 the fall or stratified until spring. Varieties are nearly always 

 multiplied by hard-wood cuttings (Fig. 49). The cuttings 

 may be taken in spring and placed directly in the ground, but 

 better results are obtained by taking them in the fall or late 

 summer. Many nurserymen prefer to take them in August, 

 strip off the leaves, and bury them in bunches with the butts 

 up. They may remain in this condition or in a cellar all 

 winter, or they may be planted in the fall. Currant cuttings 

 strike readily, however, under any method. Some growers 

 cut out the buds which come below the surface of the ground 

 to prevent suckering, but this is not generally practiced ; the 

 suckers are cut off when the cuttings are removed from the 

 cutting-bed, either to be sold or to be transplanted into nur- 

 sery rows. Green layering is sometimes practiced with rare 

 sorts, or single eyes may be used, as in grapes. Tip-layer- 

 ing, as in the black raspberry, may also be employed. (See 

 page 33.) Weak or low sorts are sometimes grafted upon 



