The literature on the influence of environmental factors in flowering coffee plants is very controversial (Drinnanand Menzel 1995). Depending on the place of cultivation, the dominant factor influencing the vegetative and reproductive cycles of coffee plants is really variable (Gopal 1974). According to Camargo (1977), when Arabica coffee is cultivated in adequate climates with favorable thermal and water conditions, it is possible to admit photoperiod as a factor conditioning the flowering season. However, Cannel (1972) suggests that seasonal variations in the floral growth and development in coffee plants could be regulated by factors other than photoperiod, since both young and adult plants of several C. arabica cultivars have shown to be photoperiodically insensitive, maintaining their flowering capacity independent of day length, being more probable that the plants’ responses were conditioned by fluctuations in air temperature and water supply.