Bui. 974, U. S. Dept. of Agriculture. 



Plate XVII. 



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Winter Twig Cuttings Rooting in a Coldframe. 



The iUiisdalion, frdin a iiliot(if;ra|ili InUi'iiiiii .liily -1, slunvslhociitlintis at I lie time the roots 

 arc foniuiii:. liulor lliis ])ro<.'e(liiro iho luUinijs arc nuuloin the fall, from naked t\vi};s that 

 ha\ !■ jiisl ariipiH'tl t heir leaves. They are kepi for a iiiouth at a temperature of about W° F., 

 (luring which time the cut surfaces hea! by ilie formation of a callus. They are then kept at 

 a tem|icralure of 10^ F. or a little less. In \ery early spring they are set in the eoldframc, 

 and as the result of their previous chilling their bnds begin to swell with the first warm 

 weather and t hey put out new leafy t wigs. I'ntil this new leafy twig growth has been com- 

 pleted, the cntt iiigs can not form roots. 



