The objective of this work was to study the different breeding systems, seed viability and seed germination in four nerium Cultivars (Nerium oleander L.). Different breeding systems like natural open pollination, autogamy, controlled pollinations and geitenogamy were studied in two seasons. In both the season of pollination no fruit set was observed in autogamy. In case of natural open pollination both the season of pollination up to five per cent of fruit set was observed in nerium cultivars. During first season of controlled pollination, intra varietal crosses maximum fruit set was observed in Pink cultivar and minimum fruit set was observed in Yellow cultivar. In second season of controlled pollination, among the different cross combination maximum fruit set was observed in Pink X White combination of crosses followed by Pink X Red combination of crosses and the minimum fruit set was observed in Yellow X Pink combinations of crosses respectively. In case of geitonogamy Pink cultivar showed maximum fruit set per cent, followed by White cultivar and least in Red cultivar. Regarding seed viability, Pink cultivar showed maximum seed viability and followed by Red cultivar and least in White cultivar. In seed germination test, maximum seed germination per cent was in pink cultivar in both nursery media and paper towel method and least in Yellow cultivar in nursery media method and Red cultivar in paper towel method. The results obtained from studies of the different breeding system can aid in planning crosses and establishment of nerium hybridization programs using compatible cultivars.

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