I am aware of my age but I know there's a lot of other young people that are interested in gardening too. I have a friend who's 15 and he has tons of plants and if he ever gets a pc I'm def gonna get him to join. Another friend of mine who's 18 has been growing plants for years and moved to Colorado for college. He's a botony major.
Anyway, I think a better question is "Why is (insert-name) forum so popular?".
I mean, what features cause people to be attracted to some forums?
I know that software upgrades can be really expensive but vBulletin 3.8.6 should have some decent options.
1. The header. The current header art's cool but the name's tuff to read and bright colors are what really attract people. The name will still stand out if it's bold and outlined. I've made similar artwork before so that's how I know. Just an idea.
2. The board color scheme. I think green would be better than blue. Just my choice. Anyway, I was really excited when one of my forums changed the colors and I was logging in and posting a lot more.
3. Does it have a chat/ shoutbox option? The music forum I like the most has that option but they're running 3.8.7. The reason I like that forum so much is cause I can log in and the first thing I see is the chatbox. It's better than a chatroom cause the chat is visible, reliable, and quick questions can be asked and answered. And it just makes the forum more fun.
Anyway, if 3.8.6 can do this without a $$ upgrade then that would be a cool new feature. They had a thread about that at vBulletin.org that was interesting.
4. I'm also attracted to sites that let members have blogs and journals.
5. flash games. There are lots of forums with these and they even have competitions. Also, there are garden-type flash games too.
Anyway, I don't know much about the $$ part or how easy/tuff it is to work with the XHTML but those are some of the things that can make a difference.
6. The users. Members can create attractive sticky threads with definite schemes that could keep people interested. That's something that would need to be discussed in a thread.
That's just some ideas.