Roussanne grapes grow well in rocky soil (many grapes do)
Roussanne is usually found in regions with a Mediterranean climate such as the Upper Rhône Valley of eastern France, and in the Tuscany region of northern Italy. Roussanne grapes are considered quite difficult to raise. Roussanne seldom produces a varietal wine but is blended with Marsanne to produce the famous Hermitage wines from the Rhône Valley. Roussanne adds acidity, elegance, delicacy and aroma to the Marsanne. Roussanne improves with age. It also produces the thick and viscous vin de paille (straw wine) of the same region and the sparkling wines of Saint Péray. It is a common component in Châteauneuf-du-Pape. It is also a component of the Montecarlo Bianco in Tuscany in Italy. Try Roussanne-based wines with Halibut, Crab, Lobster, Turkey, Duck, and Ham.
Roussanne wine usually starts at about $10. At that price try the Château Lamargue Costières de Nîmes White which is actually a blend of Roussanne and Grenache Blanc (50-50). This round wine has peach and melon flavors. From the Central Coast of California you can get a Jaffurs Wine Cellars Roussanne Santa Barbara County in the low twenties. This wine tastes of honeydew and poached pears. Stay in the same region and pay about $30 for a Tablas Creek Vineyard Roussanne with honey, pear and lemon zest flavors, and moderate acidity.