The research aims to study the differences of some aspects of physiological
activities in three ornamental plants, Conocarpus erectus L., Hibiscus rosasinensis
L, and Vinca rosea L. grown in Makkah. These plants are founded in
similar environmenta
l circumstances (drought and rewatering). Through
studying and comparing: Photosynthetic activity, maximal productivity,
strategies of drought tolerance, transpiration and hardening. Determining of
the most suitable environmental and agricultural conditions of each plant
species mentioned above have been achieved.