I think people googling will be impressed by the clean, relevant atmosphere here, especially if they have been on other free gardening Q/A sites. But most people, I think, will be a little intimidated trying to participate. It seems many people are watching the activity (over 3500 visits per day by different addresses), while only a few even read the about page (148 in all as of now). So I'm guessing thousands of folks find us helpful, but either don't think they have a question, don't think they can ask a question, or have their questions answered satisfactorily.
It seems to me that many of the questions we've been getting are very simple, and while most don't need to be closed, I think the answer quality has been higher than the question quality (which makes sense, the regular answerers on this site are higher rep folks who know their way around the site, as compared with the questioners, who are mostly new). While we don't want to make things harder for newbies than we already have, I think the ideal question quality would be higher than it is, and that would prompt better answers too.
About editing, I think this site tends to be naturally clean, and the questions are coming from an entirely different people group than are the questions on SO. I think between us here on GL, we edit quite a bit, and keep the overall appearance of the site quite tidy, IMO.
About the answers, looking at questions from the last quarter, I have to say I agree with a high percentage of the answers on them (guess why ;)), and find these answers to mostly at least satisfactorily cover the question.
I think what we're doing on-site (with the prompt answering and the near 100% answered-ness) is pretty good, the most useful thing we could work on is referring other potential users to the site, as the activity level question wise is suffering (albeit better than it was a couple weeks ago), and the answers are coming from the same people over and over again (not really a problem, but variety is the spice of life). My thing about referring folks - which I have tried to do on occasion - is that I can often directly answer whatever questions they have, on site. Oh wow, this answer's gettin' long. Anyone have a comment on one of these opinions?