I have a hop garden in KC (Liberty, MO). Last season was tough on my plants (but I got killer amounts of tomatoes). If you are going to grow in pots, be careful, it takes a lot of TLC. I am a reservist, and while gone on my two week, my hops in pots nearly died...they stressed so badly that I did not get any cones on those plants. I have found the key is to mulch the plants heavily to keep the soil moist, and water daily (in pots). Before I left for my two-week drill, my first season plants in pots had grown half way to the eaves of my house (around 10-12 feet)...this was from May to July.
Additionally, well composted soil is important (in my experience); I get mine from the Lee's Summit Landfill for $16 per yard (my ranger bed full and heaping). I have made all of my hop beds with this soil/compost.
Also remember, hops do not have to only grow vertically. I have 8 foot trellis that is 8 foot wide...they will spread horizontally also (once they hit the top of the 8 foot trellis). I also have some planted along my fence. I use the fence with twine as a trellis...they grow to maximum height of 4 feet, but spread horizontally around 15-20 feet along the fence. Mind you, horizontal spread does not seem to yield as highly as vertical growth, but it works.
A hint on twine trellis: buy cheap carabiners at Lows and tie them onto the top and bottom of your twine. Add eyelets to the trellis at top and bottom (I use a 2"X2"X2' wood stake with an eyelet as the bottom attachment). Then, you can simply unhook your carabiners at the end of the season for easy harvesting - rehook them once you have collected cones/flowers. Once the plants have died for the season - leave them on the trellis until they turn brown to ensure the nutrients in the bine get back into the rhizome - you can simply unhook the twine trellis from top and bottom, roll it up and store it. Next year, just unroll it and hook the carabiners back to the eyelets and you are ready for the season.
To keep the bugs off, you can buy praying mantis eggs online to put in and around the hop gardens...they eat a bunch of deadly plant-killing bugs (do a Google seach on "Praying mantis eggs for garden"). To reduce the threat of mold: once your bines are around two feet long, take off all the leaves up to 1 foot from the ground.
I have grown Cascade, Fuggle, Willamette, Kent Goldings, Nugget, Hollertau, Liberty, and Mt Hood in KC - some have done better than others. Experimentation regarding location, variety, soil, trellis, etc. is necessary to get a good hop garden going. I plan on expanding my gardens when I get back from "vacation" in April for a couple of weeks. Hopefully, when I get back home for good in August, I will have a decent crop.
On a final note, buy rhizomes...don't buy seeds. And, make sure you get the rhizomes from a reputable distributor, or you may end up with male plants.
Cheers,
Pikledbill