Cone size makes a HUGE difference and varies GREATLY by variety. The info. Dan posted is consistent with what I see, with Zues being the exception. I harvested around 50 cones from that (first year, 6 ft. tall) plant last year and had 1 1/2 oz. dried. A few of the cones were a full three inches long and at least an inch in diameter. Cascade seem to be on the high end size-wise and my Sterling, Centennial, Mt. Hood, and Golding fall somewhere on the lower end of the range. I think I'd need about 800 Hallertau cones to make an ounce.