I did a quick search of the main forum for topics regarding Trachycarpus and another on Dypsis. The results are clear from this one test. Topics focused on the most cold-hardy palms receive only about 1/3 the number of posts and 1/3 to 1/4 the number of views. This was just one quick search but I think the insight here is that for most PT members, topics about the most cold-hardy palms aren't that interesting or engaging for the majority of PT members. I think it is clear that PT caters mainly to palm growers of sub-tropical and tropical species. I don't think this is a conscious decision but rather a function of the representation of the membership. If we believe our target who is all palm growers and that we are lacking the diversity that temperate palm growers bring then I think the decision is clear, make a cold-hardy/temperate palm sub-board and recruit a passionate member of that sub-group to moderate that board. If we believe our target who is the subtropical and tropical palm grower then don't create a sub-board and I also wouldn't tag posts specifically related to cold-hardy/temperate palms because PT isn't designed to attract them anyways and it would be wasted effort. I will say this though, on other boards the view of PT is that of only tropical and sub-tropical palms and there isn't a need to visit PT, so if you want to tag postings or create a sub-forum then you also need to do some recruitment of posters from other boards otherwise again, you are just wasting time and effort.