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Hmm. Sure looks like you're doing everything you should and correctly. You have more citations that your competitors with the exception of Irrigation. You have more reviews. "Am I wasting my time optimizing for this? " I'd wait a while longer to see what unfolds. I'd optimize organically. I'd add "garden center" as a local search category in addition to gardener. (I used Blumenthal's category list to find your options, last updated 2/15/14.) I'd continue to accrue as many citations and reviews as possible. I'd publish a KML and GEO sitemap. (Not sure if these are still used by Google, but they can't hurt. Miriam may have an opinion on that.) I wish there was a clear and definitive answer I could give you but, as you undoubtedly know, it's just not the nature of this beast. Please do give us an update after more time has passed. I am and will be curious.