I have them strung up to the eves of my garage for the first year on the south side for full sun. They have been evenly irrigated, and the soil is very consistent. The differences in light is from the reflection of light off the garage siding, as it is white siding. The Centennial rhizomes were considerably bigger than the rest of the 5 varieties, but the Centennial in the center with the highest amount of reflected light grew to a higher elevation, over 14 feet this 1st year. The varieties in the center of the wall with the highest amount of reflected light grew and are maturing faster than those toward the lower ends of the gable. The ends have less siding to reflect light. I could only account the light variable from having no experience with growing hop bines. Thanks for the response Thunderwagn I might just climb the ladder and pick them as they mature since it is only the first year. Next year, they should be much much better if this year is any measure.