A big rock might not suit your landscaping but it might work. Or a planter like a barrel so he'd hit the barrel instead? To teach him not to pee there would be a lot of work, I like easy methods. Hmmm, on another thread we were talking about oil of peppermint to discourage critters like cats and squirrels from planters. Maybe a month of cotton balls soaked in it would keep him away and he'd forget about it? You'd have to renew the stuff frequently. Boy, I just bet you can't clean the smell of pee out of stucco.