I have Allegheny. I have bushes/trees from 2 different northern sources and 2 different southern source or province. The southern source are BARELY making it here, not surprisingly. But my Northern sourced do well. I can also tell you that there are enough phenotypically differences in the two that I very well believe there are more than 1 species. The literature talks about multiple species but does not identify the different historical characteristics.
Mine are gone for the year or I would give you some. Animals ate them all in about 10 days or less. Some squirrels and critters even clipped the darn new shoots off with the burrs still on! Seen them dragging the whole darn twig down the path like a trophy...Varmints! Don't like them to cut the new shoots but don't think I should control that either.
Don't want to jinx myself so not going to share how few of mine seem susceptible to blight
and don't want to share how many I have had for over 10 years that were never affected by blight. But when they do get it, it only seems to be 1-2 of the stems of the shrub/bush/small tree. And like jack said they grow back in about 1-2 seasons and will produce nuts again in the second season.
they are NOT easy at my zone (5a/4b) but you may be a little warmer and have better success. Remind me next September to get you some.