Pumpkin Patch around Leverkusen

Hello. Does anyone know of any places to pick or buy pumpkins for Halloween in the Leverkusen area? Last year I found a little farm in D-Erkrath, but can't remember the name or where it was.

Thanks a bunch!

Not exactly in Leverkusen, but Gertrudenhof (map) has pumpkins (and a petting zoo). They seemed to have harvested the pumpkin patch when we were there a few weeks ago, though, so pumpkin selection is from a huge crate.