Abstract: Present studies were carried out to determine the effect of environment on inflorescence pattern and fruit set behaviour of Satsuma mandarin. Data obtained showed that mean temperature for February, March and April was 9.6°C during 1997 as compared with 11.63°C in 1998. Similarly the mean maximum and minimum temperature during these three months was higher in 1998 than in 1997. Data in respect of flower opening showed that flowering was realized two weeks earlier in 1998 as compared with 1997 due to climate influence. Generaly leafless inflorescence experienced full bloom earlier than leafy ones. Significantly higher leafy inflorescence (27.05%) were noted in 1998 as compared (11.89%) in 1997 and vice versa for leafless inflorescence. There were significant differences among rootstocks in respect of inflorescence leafiness. Leafy inflorescence presented significantly higher ovary weight of 27.75 mg/ovary as compared with 22.07 mg/ovary in leafless inflorescence. Relatively higher fruitset occurred in leafy as compared with leafless inflorescence although differences were non significant. Results obtained have been discussed to establish a relationship of inflorescence leafiness with climatic forces and fruit growth.