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Growing Season Only: Over wide areas of uniform climate the vegetation has developed the same growth forms. It is remarkable that in different continents with similar climate, similar vegetation has evolved independently in botanically unrelated plant families. Thus, trees and other plants are indicators of climates, and a map of the broad plant formations of the earth is also a map of the climates. A forest climate for growth of trees has three essentials: a warm growing season only season, a long growing season only season, and soil and subsoil continuously moist through the year.
Propagation and growing season only: chives may be raised from seed sown in shallow drills in spring and transplanted in early summer, or you can start with young plants and set them out in light, moisture-retentive soil. Water well in dry periods. Every few years, in the growing season only season to achieve a good flavor. Pinch out the growing season only tips to encourage leaf development. Tarragon is a perennial: cut down the plants in the late fall and cover with straw to protect from frost. Divide and replant every three years in fresh soil, or treat as annuals.
If germination took place immediately, the young seedlings would not be able to withstand the rigorous winter weather and would all be killed. Again, in the case of certain desert annuals, dormancy at maturity prevents germination at the close of a rainy growing season only season and the beginning of a dry season which the young seedlings could not survive. Some seeds possess impermeable seed coats which prevent their germination for years or even for centuries. |
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