Why not just leave it as is as a separate general forum for citrus? This forum isn't split into subsections other than general and buy/sell and I think it does well. As other people stated - people generally post in the 'main' forum seeking a response anyway. Avoid the moderator moved thread dance and keep it all as one main forum.
Because frost hardiness problems/tolerance/strategies are much more developed in citrus culture than in other tropical fruits. You don't have a large selection of rootstock for increasing a cold hardiness in a mango, like citrus have. Also, Citrus have a wide variation of frost hardiness varying from -13F to true tropical condition. Some people may be interested just in cold hardiness topic because they want their citrus planted in their gardens. Also, container growing is much more developed in citrus than in other tropical fruit, because citrus do exceptionally well in containers. I have been the one who has suggested to avoid excessive splitting, but some splitting has to happen to get the messages organized in a easily readable form when your surf the forum. Otherwise we should have remained on gardenweb!
Also, europeans. There are many more europeans in citrus growing than in tropical growing, because, you know, citrus can be grown in colder environment and they do grow nicely in pots. If we are going to have people growing citrus then the "Buy/sell/trade" section should split in ate least 2 section: USA/Europe. I NEVER EVER visit that section because there aren't people which are willing to trade with me since I'm across an ocean and a state border, but once we have a relevant number of europeans, a place where euro people can trade with their regulation and money, without being flooded from message coming from US (or flooding people in US with their messages) is a good thing to have.
