[Improved propagation of difficult-to-root deciduous ornamental shrubs. 2: Effects of dates of sticking and growth stimulating treatments on bud burst and overwintering of rooted cuttings]

acer artificial light betula bewurzelung bouture carbohidratos carbohydrates cotinus cuttings esquejes ga gibberellin gibberelline glucide hiver invierno kohlenhydrat losses luz artificial magnolia ornamental trees perte prunus rhododendron steckling syringa winter