Final answer:
Viognier is a warm-climate grape, difficult to cultivate, with low yields and low acidity, but it produces rich and aromatic full-bodied white wines.
Step-by-step explanation:
The best description of Viognier is a warm-climate grape that is difficult to grow, producing low yields, that ripen easily but are low in acidity. Viognier is known for producing full-bodied white wines with floral aromas and stone fruit flavors. Despite its difficulty to cultivate due to its susceptibility to disease and propensity for producing low yields, Viognier can make rich and aromatic wines, particularly in regions with a suitable warm climate.