Does anyone know if Alden and AE offer particular shoes tree for particular lasts? I don't think so. How about EG, C&J, Trickers, et al.
Every Alden and Allen-Edmonds shoe tree that I've seen has been a generic cedar tree with a pretty brass plate. The pictures of the Grenson trees that I've seen makes them look like fancier generic cedar trees:
JM Weston trees are similar to the Grenson trees, only they're made from beech or some other non-cedar wood. Again, not lasted. C&J and Tricker's trees also aren't lasted:
I have previously read that EG's trees are made by the same outfit that makes JL Paris trees. I don't know if they're lasted or not, but I doubt it. In fact, the only other lasted trees I've ever seen in non-bespoke shoes are in the RLPL EG shoes. There must be others (I think that Saint Crispin shoes have lasted trees, for example), but I don't know what they are. Edited to remove some strangeness in the display of the quote.