I found a picture that I took... Affligem Hop Fields
You can see the hop bines growing up in the far background, but the near ones are just sort of mounds (no poles, trellises, etc). Is it possible that these are just young ones that they are allowing to grow along the ground? I don't know a lot about growing hops, but I've never seen anything like that. My friend, who doesn't know anything about beer brewing or hop growing, but knows a lot about beer drinking and Belgium, was convinced that these hops NEVER grow tall like the other ones. According to Brew like a Monk, Affligem uses Hallertau, Spalt, and Styrian Goldings hops. I'm not sure which (if any) of the ones growing on the hillside are used in their beer (it is not actually brewed in the Monastery).