This study was carried out during the two successive  seasons of 2014 and 2015 at Antoniades Research Branch, Horticulture Research Institute, A.R.C. Alexandria,  Egypt . The experiment was carried out  to investigate  the effects of yeast, garlic , onion, ginger and  liquorice root extracts  and their application methods on the growth and flowering of Pentas lanceolata  L. plants.The results showed that  the used extracts caused a positive effect on the growth and flowering of Pentas plants. Five grams per liter of yeast extract  caused a significant increase in most of the studied characteristics   (vegetative ,flowering  and  chemical composition)  while liquorice root extract led to the highest increase in volume and dry weight of  roots. Leaves area, leaves dry weight, stem dry weight and inflorescences. Dry weight per plant were significantly increased by the addition of yeast extract to the soil by drench