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Helianthus annuus Cultivation | Propagation | General Uses General Uses: An edible semi-drying oil is obtained from the seed. Some varieties contain up to 45% oil[61]. The oil is also used to make soap, candles, varnishes, paint etc, as well as for lighting and is said to be unrivalled as a lubricant[4, 21, 34, 46, 100]. A blotting paper is made from the seed receptacles[2, 4, 101, 117]. A high quality writing paper is made from the inner stalk[4, 14, 100, 101]. The pith of the stems is one of the lightest substances known, having a specific gravity of 0.028[4]. It has a wide range of applications, being used for purposes such as making life-saving appliances and slides for microscopes[4, 46, 61]. The dried stems make an excellent fuel, the ash is rich in potassium[4]. Both the dried stems and the empty seed receptacles are an excellent kindling[4]. A fibre from the stem is used to make paper[4] and a fine quality cloth[1, 94, 101]. A yellow dye is obtained from the flowers[4, 14, 94, 95]. A purple-black dye is obtained from the seed of certain varieties that were grown by the Hopi Indians of S.W. North America[117, 169]. Sunflowers can be grown as a spring-sown green manure, they produce a good bulk of material[87]. Root secretions from the plant can inhibit the growth of nearby plants[201]. For further Helianthus annuus gardening information |
