. Plant propagation : greenhouse and nursery practice . Plant propagation. 14 I'LANT PROPAGATION all parts of the world. The rules herein presented (29), especially those concerning moisture and heat, are fol- lowed with great care. Seeds such as acorns are very difficult to transport long distances. Usually thick- coated and bony seeds require moist, confined air; thin- shelled ones, dry conditions. For shipping to or through the tropics seeds are usually sealed in tin cases or oiled packages. Most seeds, however, sent through ordinary cool climates, after being thoroughly air dried, need be
. Plant propagation : greenhouse and nursery practice . Plant propagation. 14 I'LANT PROPAGATION all parts of the world. The rules herein presented (29), especially those concerning moisture and heat, are fol- lowed with great care. Seeds such as acorns are very difficult to transport long distances. Usually thick- coated and bony seeds require moist, confined air; thin- shelled ones, dry conditions. For shipping to or through the tropics seeds are usually sealed in tin cases or oiled packages. Most seeds, however, sent through ordinary cool climates, after being thoroughly air dried, need be placed only in cotton sacks, large paper packages or manila envelopes. Apple, pear and other small seeds are often mixed with powdered charcoal. Often more satisfactory results may be secured by growing the seedlings of species very difficult to ship in the seed form and shipping these either actively growing in wardian cases or dormant as nursery stock. The former method is not much practiced; the latter is the favorite method of nurserymen. 27. The rest period of seeds is that interval between the'apparent maturity of the seeds upon the parent plant and the time when the seeds will germinate under con- ditions normal to the species. Such seeds apparently cannot be made to sprout earlier. A majority of garden seeds will sprout within a month of the time they mature ; a few almost without any delay. It is no uncommon thing for seeds of cereals to sprout while still in the head, should the weather be wet for a consi;lera!,'; time at harvest. The mangrove normal- ly sprouts its seeds while still attached to the parent plant. The rest period is really a time of chemical change or , pot in soil, b, dibble, ripening of the foods stored in the seeds. It may be broken by drying, freezing, chemicals, or l)y freezing and FIG. 11— POT PLUNGING. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colorati
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