PROPAGATION OF TREES AND SHRUBS 15 



Buxus, box. Untreated summer (67), fall (44, 125). or winter cuttings of 

 B. sempervirens root very readily in sand (105, 125) or sandy soil (127). 

 Rooting of July (57), October (125), and February cuttings of B. sempervirens 

 was hastened by treatment but not otlierwise affected. Optimum concentra- 

 tions of indolebutyric acid are 40 mg./l., 24 hr., for that species and 20 mg./l, 

 24 hr., for B. microphylla, or 12 mg./gm. talc fcur either (61). 



Callicarpa is easy to propagate by both softwood and hardwood cuttings. 

 Hardwood cuttings of C. dichotoma taken here in early January rooted 100 

 percent in sandy soil in two months without treatment and in one month after 

 treatment with indolebutyric acid (40 mg./l., 18 hr.). Untreated summer 

 cuttings of that species root in high percentages in sand (44, 125), but root- 

 ing of August cuttings was hastened by treatment with indolebutyric acid 

 either in talc or 5 mg./l., 24 hr. (96). Late June cuttings of C. Bodinieri 

 rooted 100 percent in 20 days after treatment (5 or 10 mg./l, 24 hr.) (57). 

 Tips of shoots of C. japonica gave better results (59) and responded better to 

 low concentrations than did cuttings made of basal parts (48). 



Calluna vidgaris, heather. Summer, fall, and winter cuttings root well with- 

 out treatment. Untreated cuttings taken here in September, November, 

 and January rooted 90 to 100 percent in sand-peat in 6 to 8 weeks, more 

 slowly or less well in sand or sandy soil. Optimum concentrations of 

 indolebutyric acid are 20 to 40 mg./l., 24 hr., or 12 mg./gm. talc (61). 



Camellia japonica is not very difficult to propagate by cuttings taken in July, 

 or when new growth is only moderately hard, and planted in sand-peat 

 (30). Cuttings of the variety alba plena are less easy to root, but cuttings 

 of some other varieties root readily enough after treatment (49) with 

 indolebutyric acid 40 to 80 mg. /L, 24 hr., 12 mg./gm. talc (61), or 4 to 10 

 mg./cc. b\- the concentrated solution-dip method (49). July cuttings 

 rooted 100 percent in 10 weeks after treatment (100 mg./l., 24 hr.) (114). 

 Stevens* got equally good rooting of cuttings made of somewhat harder 

 wood following treatment with indolebutyric acid (60 mg,/l., 24 hr.). He 

 got better rooting in sand-peat than in sand, better rooting with bottom 

 heat at 70° to 75° than at 60° F. 



Caragana. Late July cuttings of pea-tree, treated or not, rooted more than 

 80 percent in sand (102). Equivalent concentrations of indolebutyric acid for 

 May cuttings of C. Boisii are 10 mg./l., 24 hr., or 4 mg./cc. bj- the concen- 

 trated solution-dip method, or 2 to 5 mg./gm. talc (49). 



Ca-rya Pecan, pecan. Hardwood, early April, cuttings of the variety Posey, 

 made of wood two to four years old, were allowed to callus in moist 

 sphagnum at 68° to 78° F. for about three weeks, then treated with in- 

 dolebutyric acid (100 mg./l., 24 hr.) and set in sand at 70° F. bottom 

 heat, where large cuttings, a half inch in diameter, rooted 63 percent (95). 

 Smaller cuttings rooted less well and there was no rooting of the un- 

 treated. Equivalent concentrations for treatment of such cuttings are 

 40 mg./l., 24 hr., or 2 to 12 mg./gm. talc (49). 



Catalpa. These can be propagated by softwood, summer cuttings in sand 

 (105). L^'ntreated cuttings of western catalpa rooted 77 percent (33). 

 Equivalent concentrations of indolebutyric acid for April cuttings are 5 

 to 12 mg./gm. talc or, by the concentrated solution-dip method, 4 

 mg./cc. (49). 



* Stevens, Robert F. The genus Camellia with special reference to the propagation by 

 cuttings. Thesis submitted for the degree of Master of Science, Massachusetts State 

 College, May 15, 193 S. 



