Escargot begonias (Begonia rex) are a variety of rex begonia that produces spiral-shaped foliage that curls around at the base of the leaf. They're typically grown for their showy foliage, not their flowers. Escargot begonias prefer partial sunlight, moist but well-drained soil and plenty of fertilizer. They require little maintenance and pruning isn't necessary. Escargot begonias grow best in areas with high humidity, but excessive watering can cause fungal diseases or rot.