FLOWER SHOW — March 21–25, 2012San Francisco Flower and Garden ShowSan Mateo Event Center, 1346 Saratoga Dr., San Mateo, CaliforniaWhether you're green thumbed or simply have two twiddling thumbs looking for something fun to do, check out this year's San Francisco Flower and Garden Show. You can shop all day for flowers, rare plants, orchids and other offerings from more than 200 exhibitors, plus learn how to grow edibles and hear from Ahmed Hassan of the DIY Network's Yard Crashers. Celebrity chefs, including Greens Restaurant's Annie Somerville and Martin Yan will do demonstrations.Hours: Wednesday–Saturday, 10 a.m.–7 p.m.; Sunday, 10 a.m.–6 p.m.Cost: all-show pass, $25; one-day ticket, $16 adults before March 11, $20 adults beginning March 12; free to those 16 and younger