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Plant Growth: It is the gardener's task to make use of the weather as much as possible. Temperature directly influences the rate of plant growth. The fastest growth will take place at the higher temperature limits of an individual plant's tolerance. A plant classified as tender will not endure temperatures below 32°F (0°C). A half-hardy plant can stand a few degrees of frost, but not a cold winter. By contrast, a hardy plant can tolerate considerable cold. Naturally, the degree of hardiness varies from plant to plant. How well a plant grows in an area depends largely on its native climate and on how easily it can adapt to its new environment.
The second revolutionary advance in developmental plant biology was one made by botanists themselves. It was the discovery of several new plant hormones, substances which regulate the growth and development of plants. For almost 30 years after its discovery as a plant hormone in 1926, auxin had been regarded as the substance that could account for nearly all the phenomena of plant growth and development in which hormone action was involved.
The growth of plants can also be greatly influenced by applying materials known as plant hormones [7] or plant growth regulators. Used in very small amounts plant hormones promote, inhibit or modify the physiological processes within the plant and include auxins, kinins, gibberellins and abscisins. Compared with fertilizers they are relatively little used, although they are the subject of considerable research. They can all be produced artificially and their main areas of application are to fruit, vegetables and cereals.
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