“…Temperature, soil moisture and photoperiod have been identified as the principal factors triggering foliage, flower, and fruit production in different plant communities (Rathcke & Lacey, 1985). For arid zones, the accepted argument is that phenological patterns are intimately related to the availability of water (Ackerman & Bamberg, 1974;Opler et al, 1980;Turner & Randall, 1987;Gutterman, 1991;Bertiller et al, 1991;Friedel et al, 1994;Fresnillo-Fedorenko et al, 1996). In addition, other studies have documented the influence of temperature and photoperiod on flowering and fruiting in desert plants (Frankie et al, 1974;Turner & Randall, 1987;Gutterman, 1991;Friedel et al, 1994;Abd El-Ghani, 1997).…”