Weed infestation of horticultural crops in gardens, parks and orchards has become a menace bedeviling productivity of fruits and vegetables. Nutgrass (Cyperus rotundatus L) is one of the weeds found on Horticultural farms whose leachets and exudates influences the performance of crops grown in farms and orchards on different soils. Paw paw is a common orchard crop grown for commercial purpose in the tropic with intense economic returns. This study investigates the allelophatic effects of nutgrass extracts (50g/cm3, 100g/cm3, 150g/cm3, 200g/cm3, 300g/cm3 and control) in different soils ( Sandy, Loamy, clayey and Silty) on the seedling growth of Paw paw (Carica papaya L) in a split plot experiment replicated 3 times. The study unveiled that with increased concentration of nutgrass extract the growth performance of pawpaw seedlings significantly decline. Similarly the soils with better porosity, high water holding capacity as well as high in nutrient retention (such as loamy and silty soils) support better seedling performance in pawpaw. It is therefore noted that to reduce the allelo- effect of decomposing leachets and exudates from weeds (Nutgrass) on farms, regular weeding and complete destruction and removal of weeds (Nutgrass) around the base of paw paw plant in the orchards is recommended. Sandy soil has less effect on allele activity of Nutgrass than other heavy soils.