Comparative data based on the best reliable sources of information relative to planting seasons and lawn-seeding seasons are so interesting and so valuable, as a basis of establishing definite relationships among varying sections of the United States, that the writer has been prompted to attempt a diagrammatic and a tabulated analysis of this important question (See Plate III).
Considered from the standpoint of a plant the act of transplanting is a violent one and consists of stopping at once a large part of its vital activities, generally causing the loss of a considerable part of its root system. Therefore, transplanting should be accompanied by precautions to prevent too great loss of moisture by transpiration, and by measures to assist the plant in starting growth at the earliest possible date. Seeding differs from transplanting in that a seed is a ripened embryo which is a minute but complete dormant plant. As the process of germination includes the making of a vital connection between the young plant and the soil sufficient to enable the plant to produce green tissue and support itself, seedage must also be surrounded by precautions to insure proper conditions for germination. One of the most important factors in transplanting or seeding is the selection of the correct season, because upon the successful start of the operation depends the whole future of the plant. Plants grown in pots, or so root pruned that nearly all their roots may be moved with them, are, of course, in condition to be moved at all sorts of odd seasons, but this latter is the work of experts or trained gardeners and is not to be recommended to amateurs on account of the technical knowledge and skill required both during the planting operation and in the way of proper after-care and maintenance. This discussion is confined to transplanting dormant plants and to seeding of lawns, under the following headings:
(b) Evergreen Plants Coniferous and Broad-leaved)
(c) Herbaceous Perennials
(d) Lawn Grasses
Greenhouse plants and the propagation of plants by seeding, except as referring to lawn grasses, are not included because conditions vary so widely in the same locality.