–Put up lots of photos. Photos of plants, photos of people, events, happenings, birds, bugs, whatever.
–Link to other blogs, and if you have time, post comments on other blogs. That will drive readers to your site.
–It’s fine to use a blog just to post news of upcoming events, etc., in which case it’s really more like a "what’s new" page of your website. But blogs REALLY attract readers when they say something honest and insightful and opinionated. Most organizations and corporations are afraid to express an opinion, but real people have opinions and it’s interesting to read them. This could be anything from taking a strong stand for or against an New York Times op-ed, to complaining about how gross it is to have to put on waders and clean out the lily pond. (Or how great it is to do that!)
–Let your personality shine through. Try to get as many people as possible to post on the blog and talk about who they are, what they do, maybe some quirky insider information about themselves and what they do at the garden, etc. This could include guests, like speakers or visiting botanists.
–Comment on other blogs and what’s happening in the world around you. Blogging is supposed to be a conversation, not a one-way flow of information. For instance, a lot of garden bloggers do this "Bloom day" thing where you post a photo on the 15th of every month showing what’s in bloom in your garden. Or maybe you respond to some news about global warming, an interesting YouTube video, or respond to these year-end round-ups in the news of the best garden books of the year.
–Check out the most awesomeist blog we know of by a garden company–that of The Golden Gecko. Trey is always honest, straightforward, thoughtful, and personable. He thinks about the big picture and all the little stuff. He really lets us see what goes on behind the scenes. You rock, Trey.