Just ordered 3 varieties: Hallertau, Cascade, and Centennial. I've got a spot next to our silo (60 feet tall!) that gets ample sunshine all picked out, now what do I have to do to prepare the soil? Do I need to till, add water to get the proper moisture content, etc? How close together should I plant the three rhizomes? Also, how close to the silo's foundation can I plant them? Any fertilizer that is recommended? Thanks for any tips/tricks to get my new crop off to a great start!