http://gardenrant.com/ - This blog is about as "pro" as it gets. The layout is very clean and the content is very frequently updated (as it should be with so many contributors). They have authors from all over the country, which means you are likely to get some advice that relates to your climate (or close enough). The site has advertising on it, but most is to direct you to local gardening organizations or other information. And, the ads are unobtrusive. I end up clicking around for hours. This is a pretty cute story.
http://www.kissmyaster.co/ - Gotta love this blog. One of my favorites for the humor and the eccentricity of the gardening. She even uses bowling balls in one of her garden beds. This blog reads a lot like a diary from a gardener. This, like You Grow Girl, is another punk rock inspired gardening site. Flowers, tattoos, and loud music seem to have a common appeal...
http://awaytogarden.com/ - Another pro as fuck garden blog. This one has killer photography and a ton of content. There are also extras like canning and freezing posts and "doodles" by Andre Jordan - whimsical garden cartoons.
http://gardeninggonewild.com/ beautiful, clean layout. The photographs and images are fantastic. The content is fresh. There is a whole category devoted to succulents. A lot of the writing has a sort of metaphysical / soul searching / mindfulness vibe to it, which is a pleasant bonus. The garden photography section just has some
http://yougrowgirl.com/ - This is probably my favorite. The photography is really captivating, the posts are interesting and fun to read, and she updates frequently. Gayla makes use of the "slow season" in gardening by posting reflections to warmer days and home crafting ideas. A huge plus for quoting punk rock bands on your site. This is really useful for those needing to google gardening terminology frequently: http://yougrowgirl.com/glossary/.
http://www.renegadegardener.com/ - This blog has a lot of great information on it. Its freaking hilarious too. I love the "Don't DO That" segments. My only disagreement: "Gardening and rock music do not mix". Bullshit. Listen to whatever music you like. Gardening to me is therapeutic. I garden to bring joy to myself and to my community who can also appreciate the beauty of plants. Music is the same. Listen to whatever suits your mood. If you listen to music and connect on an emotional level? Do it. And, do it in the garden if you want to. Now to be fair, he didn't say "gardening and melodic death metal do not mix", so I'll get a dismissal on technicality. My apologies for that slight digression...everything else this author writes about is completely dead on. I have to do a zone conversion from his posts since he gardens in Minnesota. His "myth of the week" column usually elicits a "hell yes!" from me. I also sung in praise when I read his post on landscaping fabric as a torture device.