Yopper,
Supposedly, Evans comes 'true' from seed.

Mine suckers pretty profusely on its own, but if you wanted to foster more suckers, it might be helpful to do some root pruning - step out 4 ft or so away from the main trunk, and cut all the way around the tree, in a circle - you should get more suckers popping up from the roots that you 'damage' in this manner. Mine seems to send up more suckers each year, most coming up in the vicinity of where I've dug out suckers from previous years.