This work was carried out during the two consecutive seasons of 2016/2017 and 2017/2018 in the Experimental lathe house of Horticulture Dept., Faculty Agric., Benha University, Kalubia Governorate, Egypt to study the effect of paclobutrazol (PP333), cycocel (CCC) and pinching treatments as well as their combinations
on growth and flowering of potted Jacobinia carnea plant. After one month from repotting process (mid-March during the two seasons), the plants were arranged into two groups; the first one was lifted without pinching, while
the second group was subjected to pinching treatment by removing 1cm from the seedling top, then all plants of the two groups were subjected to three sprays with paclobutrazol at 50, 75 and 100 ppm and cycocel at 1000, 2000
and 3000 ppm plus tap water as control at one month intervals. The obtained results showed that all pinched plants received growth retardants treatments were shorter than those received growth retardants without pinching in the
two seasons. Anyhow, the highest values of branches number/ plant, leaves number/plant, leaf area/plant, leaves fresh and dry weights/plant, flowers number / plant, fresh and dry weights of flowers / plant and show value were
scored by those subjected to pinching treatment and sprayed with pp333 at 100 ppm in the two seasons. Moreover, all tested application of growth retardants and pinching as well as their combinations increased root growth parameters of jacobinia plants, with superior for the high concentration of PP333 or CCC in the two seasons.