Growth, yield and vase life of rose as influenced by different cultivars under protected condition of Eastern Himalayas

An investigation was carried out to evaluate the performance of four exotic rose cultivars (Sphinix Gold, Upper Class, Bordeaux andAvalanche) under protected condition in sub-tropical hills of Nagaland. High coefficient of variation both at genotypic and phenotypic level couple with high heritability and genetic advance for thorn density per inch. The genotypic correlation coefficient studies reveal that plant height at first flower flush was positively and significantly correlated with plant spread EW/NS direction, thorn density per inch and diameter of flower bud.Significant positive association of total number of petals per flower was revealed with plant spread EW/NS direction. Length of the sprouted bud was similarly a significant positive correlation with diameter of flower bud and thorn density per inch, length of the sprouted bud and days taken to bud sprouting. Phenotypic correlations of plant height at first flower flush with number of branches per plant, thorn density per inch. Similarly a significant positive correlation was observed between diameter of flower and length of the sprouted bud. Significant positive correlation also existed between number of flower per plant and number of petal per flower. Since there is a highly positive association among this component character, the selection of this particular character for improvement of any cultivars shall automatically influence other character in desirable direction. Among the cultivars studied the Sphinix Gold,Upper Class and Bordeaux are suitable for commercial cultivation under Nagaland condition.