The first thing that comes to my mind when I see the word "Tuscan" is Italian cuisine, so I'd probably look under Food & Cooking for Tuscan-related information. But because it's a multi-purpose garden project, it could also fit in Nature or Do It Yourself. Great help, aren't I!!

I vote for Food and Cooking.
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When you don't like a thing, change it.
If you can't change it, change the way you think about it.

(Maya Angelou)