Propagation and Vegetational Management of Wild Flowers : Germination, Cutting Propagation, and Frequency and Timing of Mowing for Extending the Flowering Season of Aster ageratoides subsp. ovatus Kitam.

概要

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To develop technical methods for the creation of the visually attractive sward abundant in wild flowers, germination characteristics, cutting propagation, and frequency and timing of mowing was studied on one of the typical wild flower, Aster ageratoides subsp. ovatus Kitam. Seeds showed good germination at 15-25°C, even under dark conditions. Under light conditions they recorded high germination percentages even at 30°C. Seeds in dry storage below 25°C could keep their germination ability for at least one year. Therefore, whenever good water is able to be provided, good seasons for sowing seem to be wide in range.Where seeds were sowed in April, flowers were observed in the autumn of that year. As far as irrigated suitably after cutting treatment, roots developed from 90% of cuttings. Sufficient flowering was maintained and the height of sward was controlled to 20-30 cm by early July mowing, or early June and early August mowing. A poor flowering state was induced, on the other hand, by Septembe mowing. Because of the good temperature for germination and the considerable effect of cold stratification, seeds dispersed in December in the field may sprout in early spring after cold and wet winter. Thus, the sward will extend. Individual plants regenerate with rhizome.