To cultivate begonias effectively, begin by choosing a site that receives full sun to partial shade, ideally one that enjoys four hours of direct sunlight daily to promote healthy growth. For plants in containers, opt for a high-quality soil mix enriched with organic materials such as compost or peat moss to maintain moisture around the roots. It is essential to water your Double Begonia weekly, ensuring the soil remains moist without becoming waterlogged. Watering should be deep but infrequent. Prune the plants as necessary to encourage denser growth and control their size, which also helps prevent legginess. During the growing season, apply a balanced liquid fertilizer biweekly for optimal results. Additionally, promptly remove any dead or diseased leaves to avert issues like rot or disease. In their first year, these plants may bloom late into summer and autumn; however, the foliage will die back quickly after the first frosts. It is advisable to cover them with mulch and trim any remaining growth.