Intercropping is the growing of two or more crop species at the same time and in the same field. Sweetpotato [ Ipomoea batatas (L.) Lam.] is receiving new attention as a life-saving food crop in developing countries. Jugo bean [ Vigna subterranea (L.) Verdc.] is a leguminous species similar to peanut ( Arachis hypogaea L.). Though leguminous crops have been associated with sweetpotato under intercropping systems, it is not known what effects different jugo bean populations could have under intercropping with a fixed population of sweetpotato. The objective of this experiment was to assess the effects of jugo bean plant population on physiological growth indices and crop yields under intercropping.