Some aspects regarding the cultivation ex-situ of Amsonia walter species with decorative value
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SÎRBU, Tatiana. Some aspects regarding the cultivation ex-situ of Amsonia walter species with decorative value. In: Conservation of plant diversity, Ed. 3, 22-24 mai 2014, Chișinău. Chișinău: Gradina Botanica (Institut), 2014, Ediția 3, pp. 114-115. ISBN 978-9975-62-370-4.
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Conservation of plant diversity
Ediția 3, 2014
Simpozionul "Conservation of plant diversity"
3, Chișinău, Moldova, 22-24 mai 2014

Some aspects regarding the cultivation ex-situ of Amsonia walter species with decorative value


Pag. 114-115

Sîrbu Tatiana
 
Gradina Botanică (Institut) a AŞM
 
Disponibil în IBN: 20 mai 2019



Teza

Introduction The genus Amsonia Walter (family Apocynaceae) contains 20-22 species. The majority native to North America, Europe and Asia. Amsonia species are herbaceous perennials from a woody, long-lived root, erect, with latex, without stolons. Leaves alternate, membranous. Cymes thyrsoid or corymbose, terminal. Flowers blue or bluish. Sepals narrowly acuminate, usually without glands. Corolla blue or bluish, tube cylindric, dilated above middle, villous inside; lobes overlapping to left. Stamens inserted inside dilated portion of corolla tube; anthers ovate or oblong, free from pistil head, base rounded. Carpels united by a fi liform style; ovules numerous, biseriate on each placenta. Pistil head with a basal membranous appendage. Follicles 2, cylindric-fusiform, erect. Seeds cylindrical and obliquely truncate [1]. Material and methods The studies were carried out in 2011-2013 at the experimental fi elds in Botanical Garden of ASM in the Laboratory Floriculture. The bio-morphological peculiarities and phenologic observations were registered using standard methods [2, 3]. Floral, foliar and habit traits were observed and compared for two bluestar: A. tabernaemontana Walt. and A. eliptica (Thunb. ex Murray) Roem. et Schult. Information was collected about abundance of fl owering, fl owering period, its durationon, plant size, habit, disease and pest resistance, cultural adaptability to the local environment, winter hardiness and drought. Results and discussions Amsonia (Bluestars) is indicated for sunny locations with rich soil, well drained and quite wet. Accepts the heavy soils, clayey, just with good drainage. Grow in shade, but with a more modest fl owering. Plants can be grown in the same place about 10 years, if loose, processed, watered regularly and given the necessary fertilizers. Scheme planting is 50 x 50 cm. Vegetative multiplication is performed - by dividing the bush in autumn or early spring. Do cuttings in early summer. A. tabernaemontana easily multiplied by seeds, which are usually sown in February-March in greenhouses. Their stratifi cation is required for 3-5 weeks. Or late autumn sowing directly in the soil. The seedlings transplantation is indicated on defi nitive place only over a year. A plant of about 4-5 years, divided, resulting in 8-12 planting units. And stem cuttings, we can get 35-40 new plants. Bluestars are indicated as cut fl owers in fl oral art, and of course landscaping within the fl oral decorations: solitary, in groups with other species of perennial or annual in borders, mixborders or on the banks of ponds, terraces and in the pots. The compositions with Santolina virens, Hypericum olimpicum, Hosta albo- marginata, H. plantaginea, Aster dumosus etc. creates admirable effects of color and form. Conclusions The Amsonia species proved to be hardy, low-maintenance perennials giving three seasons of interest in the garden. The leaves and habits of bluestars were unaffected by diseases or insects. The plants are winter hardiness and drought. Only A. tabernaemontana received of high seeds production in the local environment. Too little known, we recommend bluestars to be included in the fl oral assortments, suitable for rural and urban green spaces.