24 MASS. EXPERIMENT STATION BULLETIN 382 



Juniperus chinensis var. Pfitzeriana, Pfitzer juniper. Cuttings are usually 

 difficult to root in good percentages (103), but untreated cuttings rooted 

 100 percent in sandy soil in 4 months, 86 percent in sand in 11 months, 

 when taken here in August. November cuttings have often rooted better 

 than those taken later (13, 31, 57) but they sometimes root as well if 

 taken in December and January (103). Rooting of cuttings taken here 

 in December was improved by treatment with indolebutyric acid 

 (50 mg./l., 24 hr.), 100 percent of the treated cuttings rooting in 5 months, 

 but that treatment apparently injured August cuttings. Cuttings taken 

 in early February rooted, in about 15 weeks, 20 percent without treatment, 

 92 percent with Hormodin No. 3 (103). 



Juniperus communis, common juniper. Cuttings of prostrate juniper rooted 

 about equally well when made of wood one,, two, or three years old, but 

 wood two or three years old results more quickly in larger plants (69). Cut- 

 tings of /. communis var. Ashfordii which were taken here in December rooted, 

 without treatment, 50 percent in sand or sand-peat, 80 percent in sandy 

 soil; and those which had been treated with indolebutyric acid (100 mg./l., 

 22 hr.) rooted 60 percent in sand, 90 percent in sandy soil. Taken here in 

 December, cuttings of Irish juniper treated with indolebutyric acid (100 

 mg./l., 20 hr.) rooted 75 percent in sand in 6 months ,100 percent in sandy 

 soil in 3 months; and untreated cuttings rooted as well but more slowly. 



Juniperus horizontalis, creeping juniper. Untreated cuttings of Waukegon 

 juniper rooted more than 90 percent in 8 weeks when taken here in No- 

 member and December. They also rooted well if taken in summer (14), 

 but summer cuttings of the variety plumosa rooted less well than fall and 

 winter cuttings (123). Fall and winter cuttings root so readily that treat- 

 ments may be without much effect (57, 83) except sometimes in increasing 

 the numbers of roots on each cutting (125). A higher concentration of 

 indolebutyric acid is suggested for cuttings in the first stages of dormancy 

 than for those taken in the winter (57}. 



Juniperus procmnbens. Untreated cuttings rooted more than 90 percent in 

 sand-peat when taken here in early November, less well if taken in Feb- 

 ruary. 



Juniperus Sabina, savin. Cuttings rooted better when taken in late fall or 

 early winter than when taken later (13,31). Untreated cuttings of the 

 variety tamariscifolia taken here in late November rooted 90 to 100 percent in 

 sandy soil or sand-peat, less well in sand. 



Juniperus virginiana, red cedar, and its varieties have not been easily prop- 

 agated by cuttings even after treatment (17, 18, 57, 83). Cuttings of the 

 variety Kosteri taken here in December failed to root without treatment, but 

 cuttings treated with indolebutyric acid (100 mg./l., 20 hr.) rooted 58 

 percent in sandy soil, less well in sand. 



Kalmia lafifolia. mountain laurel, is considered difficult to propagate by 

 cuttings (73, 113), but there was 100 percent rooting of untreated Novem- 

 ber cuttings in a mixture of cinders and peat, 1:1, with bottom heat at 

 80° F. (29). Sand-peat is also a good rooting medium (51). Rooting of 

 late July cuttings, poor at best, was more improved by indoleacetic acid 

 (90 mg./l., 24 hr.) than by indolebutyric acid (88). Rooting of early- 

 winter cuttings was also improved by indoleacetic acid (100 mg./l., 48 hr.); 

 66 percent rooting with it, 12 percent without it, in 5 months (113). Leaf- 

 bud cuttings gave better results than ordinary stem cuttings and, taken 

 in late July, leaf-bud cuttings rooted 80 percent in 19 weeks after treat- 

 ment with indolebutyric acid (90 mg./l., 24 hr.), 20 percent without it (88). 



