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Bacillus thuringiensis. Biological insecticide that kills caterpillars but is harmless to the environment and higher warm blooded animals.
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Basal In plants that form rosettes, the basal leaves are those that arise directly from the crown of the plant, and which often differ from leaves arising from the stem.
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Biennial A plant grown from seed that under normal conditions takes two years to complete its life cycle, developing a leafy tuft or rosette the first season then flowers, seeds and dies the second year.
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Bipinnate Where the primary leaflets are divided into two - or secondary leaflets
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Blossom End Rot It's caused by a deficiency in calcium, a water-soluble element. Tomato plants that suffer from water stress or extreme fluctuations in moisture are prime candidates for blossom-end rot. Other conditions that make tomatoes susceptible are cool, humid weather, compacted soil, and high levels of ammonia or potassium in the soil. Prevent by keeping soil evenly moist and well mulched. Add lime if you have an acidic pH and low calcium; add gypsum if your soil is alkaline and calcium-deficient.--
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Bonsai The art of growing miniature plants by trimming the roots
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Botanical Name The international, scientific name of a plant, agreed upon by botanists to apply uniquely to a particular species, and denoting its relationship to other, similar plants. The Latin name consists of two parts: the first, called the generic name, as it states the genus to which the plant belongs; and the second, called the specific name as it describes the species to which the plant belongs. If there is a variety or cultivar name as well, it follows the specific name. In written form, the generic name is capitalized, while neither the specific nor the varietal name is not; all are italicized. A cultivar name, if used, should be non-italic and enclosed within single quotation marks.
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Bract A leaf that seems part of the flower cluster of a plant, or in the case of plants with insignificant flowers, may substitute for it in appearance by its bright coloring. Bougainvilleas are an example of wonderfully colorful bracts.
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Bud A dormant, immature shoot from which leaves or flowers may develop.
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Bulbil Small bulb-like organ which sometimes forms in place of flowers.
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