This research aims to determine the main and interaction effects treatment of boiler ash and paitan compost (Thitonia diversifolia) against growth of cocoa seedlings (Theobroma cacao L.) Clone BI-50. Research has carried out at the Experimental Garden of the Faculty of Agriculture, Riau Islamic University, Kota Pekanbaru, from June to October 2023. Research using Completely Randomized Factorial…