Growdown! The Great Tucson Garden Design Challenge 8:30 a.m. to 4:30 p.m. Saturday, March 22 Tucson Botanical Gardens 2150 N. Alvernon Way 326-9686; tucsonbotanical.org By this point, there’s probably been a competition-style reality show for pretty much everything. You’ve got your iron chefs and your biggest losers, even your grocery baggers and storage unit hoarders. […]