Making vegetables grow in Houston's clay soil, pest-riddled humidity and searing heat is tough. Doing it without any pesticides or artificial fertilizers is even tougher. So, to the increasing number of people in this city who want locally grown, organic produce, Joan Gundermann is quickly becoming a celebrity. Her 70-acre farm in Wharton County is the only certified-organic outfit in the region, and for 20 years it has consistently grown some of the best-tasting, most unique fruits and vegetables available anywhere. Her freshly picked peaches and tomatoes can't be beat for flavor. Or try one of her more bizarre offerings, such as bright red carrots, purple cauliflower and heirloom kale. You'll find her wares at Central Market or through one of the city's numerous food co-ops. But to catch a fig at its freshest, meet Gundermann in person every Saturday at 3106 White Oak Drive, at the Houston Farmers' Market.