The way I understand it is that you need different varieties of Chestnuts nearby for optimum pollination.
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Nope, you just need multiple trees because Chestnuts are not self fertile. Variety has nothing to do with it.
I disagree but whatever
I think your both saying the same thing. Can't just plant say 5 AU buck iv and expect pollination as they are grafted trees of the same variety.
However planting a few seedling chestnuts will essentially do the same thing as planting multiple varieties (ex. Dunstan, Chinese, au buck). They are all different trees, but are also the same variety(Chinese) .
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A lot of chestnuts are sold by chestnut Ridge of Pike County in Illinois to folks who frequent this site and other deer related sites. I believe - unless I misunderstood conversations with the owner - every one of those chestnuts are from Dunstan cultivar trees; no other variety/type/cultivar is planted at their farm.