. Plant propagation : greenhouse and nursery practice . Plant propagation. J i8 PLANT I'KOl'AGATION 170. Evergreen mature wood cuttings, esi)ccially of cone-bearing lilants (arbor vit;e, juniper and retinospora) are fall planted under cover in sand either in a cool greenhouse or some other cover. Usually they take root slowly, sometimes a full year (yew, juniper), but continue green if properly shaded and watered. After rooting they may remain in the flats till the following season for out-of-door planting or may be potted. The cuttings, usually four or five inches long, are always made of wel
. Plant propagation : greenhouse and nursery practice . Plant propagation. J i8 PLANT I'KOl'AGATION 170. Evergreen mature wood cuttings, esi)ccially of cone-bearing lilants (arbor vit;e, juniper and retinospora) are fall planted under cover in sand either in a cool greenhouse or some other cover. Usually they take root slowly, sometimes a full year (yew, juniper), but continue green if properly shaded and watered. After rooting they may remain in the flats till the following season for out-of-door planting or may be potted. The cuttings, usually four or five inches long, are always made of well-ripened wood some- times two, three or even four years old. The needles or leaves are cut from the lower two-thirds of the stem with a sharp knife. They should never be pulled or rubbed off. Remaining leaves are not covered with soil. Probably all cone-bearing trees may be prop- agated by cuttings. It is not, however, prolitable to grow pine this way; seed is cheaper. Spruce cuttings are very slow to root (12 to 18 months) so fine varieties are generally FIG. 105—CALLUSING BED FOR CUTTINGS AND ROOT GRAFTS In the bundles of grafts and cuttings are placed in fall or winter for spring planting. 171. Eose cuttings of dormant wood are largely used both out of doors and under glass. ^\ hen to be grown out of dnors the cuttings are made about six inches long from mature wood in the fall before severe freezing weather comes. Bundles are stored in sand over winter and planted in spring in V-shaped trenches with only one bud showing. Rich soil produces strong plants in one sea- son. When grown under glass the cuttings are made in November or December and planted in sand in cold frames or cool greenhouses. By February or March they may be potted. W hen warm weather arrives they are planted in rich soil. 172. Ringing roses to facilitate cuttings propagation was done experimentally by Greiner, a French investigator, who found that such cuttings strike root much more read
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