Flower Production and the Accumulation and Distribution of Carbohydrates in Different Parts of Baccara Rose Plants as Influenced by Various Pruning and Pinching Treatments

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Abstract
The effect of spring and autumn pruning, and of continuous pinching of flower buds in the summer, on the winter yield of Baccara roses and on the distribution of carbohydrates in different parts of the plant throughout the year was examined. Pinching of flower buds on plants pruned in the spring and autumn had no effect on the winter yield. However, pinching markedly reduced flower yield if the plants were not pruned in the spring. The general trend of changes in the starch and sugar contents in the different parts of a rose plant growing in a greenhouse in Israel, where growth continues throughout the year, is similar to that occurring in roses and deciduous trees growing outdoors in northern countries. Maximum starch level was found in May, after which the level gradually dropped to a minimum in September-December. Thereafter, it increased again to the spring maximum. Removal of flower buds in the summer extended the winter period of low starch content and delayed the beginning of its subsequent increase. Spring pruning considerably reduced starch content and postponed the date of maximum accumulation from May to August.

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