PROPAGATION OF TREES AND SHRUBS 25 



Kalmia polifolia. Untreated cuttings rooted 100 percent in 3 months in sand- 

 peat when taken here in mid-September, much less well when taken in 

 mid-July. 



Kerria japoiiica. Untreated softwood, July, cuttings rooted 100 percent in 

 sand-peat, less well in sand (14). Treatments with indolebutyric acid (57) 

 and indoleacetic acid did not increase percentages which rooted, but root- 

 ing was hastened by indoleacetic acid (33 mg./l.) (113). 



Keteleeria Davidiana. December cuttings rooted 100 percent in 7 weeks 

 after treatment with indolebutyric acid (100 mg./l., 24 hr.), not at all 

 meanwhile without treatment (109). 



Kolkwifsia amabilis, beauty-bush. Softwood, summer, cuttings, made of the 

 tips of shoots (48) usually root well in sand (105) or sandy soil (80). 

 Rooting of June or July cuttings was hastened by treatment with indole- 

 butyric acid 12 mg./gm. talc or 20 mg./l., 24 hr. (49), or 60 mg./l., 4 hr. 

 Cuttings given the last named treatment rooted 100 percent in 34 days 

 (125). 



Laburnum anagyroides, golden-chain. Softwood, July cuttings, made with 

 the basal cut at a node, rooted 100 percent without treatment (14). 



Larix sibirica, Siberian larch. There was some rooting of softwood, early 

 summer, cuttings treated with indoleacetic acid (50 mg./l., 24 hr.), not of 

 the untreated; but cuttings of slightly harder wood, taken two weeks 

 later, failed to root whether or not they were treated ' (65). 



Lavandula officinalis, lavender. Summer cuttings, untreated, root readily 

 in sandy soil (80, 105). 



Lespedcca. Cuttings of L. Thunhcrgii taken here in early October rooted 

 66 percent in sandy soil after treatment with indoleacetic acid (100 mg./l., 

 18 hr.), not at all without it. The species is also propagated by cuttings 

 taken in summer and rooted in sandy soil (80). 



Leucothoe Catesbaci is easily propagated by softwood cuttings (67), made 

 with the basal cut a half inch below a node (14). July cuttings rooted 

 100 percent in sand-peat in 12 weeks without treatment or in 10 weeks 

 after treatment with indolebutyric acid (10 mg./l., 24 hr.) (88). This 

 species is also readily propagated by leaf-bud cuttings whicli, taken in late 

 June, rooted 100 percent in 10 weeks without treatment (90). 



Libocedrus decwrens, incense cedar. Untreated cuttings taken here in No- 

 vember remained alive but unrooted in sand-peat for 15 months. Some 

 of them were then treated with indolebutyric acid and all were replanted. 

 Those treated with 150 mg./l., 24 hr., rooted 100 percent in the next 9 

 weeks. Results were a little less good with 75 mg./l. and only 50 percent 

 of the untreated rooted in a total of 22 months. 



Ligustrum. Privets can be propagated by softwood, summer, cuttings in 

 sand or by hardwood, fall, winter, or early spring cuttings. Early summer 

 cuttings of Japanese privet rooted best if made of growing tips, not older 

 wood (125). There are sometimes more roots per cutting or more rapid 

 rooting following treatments with indolebutyric acid (57, 83, 117), optimum 

 concentrations for California privet being 80 mg./l., 24 hr., or 12 mg./gm. 

 talc (61). For privets in general, naphthaleneacetic acid is more eflFective 

 (49). Concentrations of 60 mg./l., 24 hr., or 1:250 in talc liastened root- 

 ing of September cuttings of L. cnmpactuni (96). 

 Lindera Benzoin, spice bush, is sometimes propagated by summer cuttings 



