RE: Imperial Whitetail Extreme!
The extreme, like most perrenials, is pretty slow-growing compared to grains and brassicas. I mixed mine with clover and I've found it's pretty even in growth with the clover, with the chicory being a little faster. Basically, the brassica should be the tallest, then the chicory, then the clover or Extreme.
Mine was mixed with oats and a little rye, with the oats and rye being what I expect the deer to consumer during the fall, and the oats freezing out and dying during the winter, leaving the extreme and clover to take off in the spring. So far, so good, but it is pretty slow.