Begonia rex Macarena is a rhizomatous hybrid begonia. Its spectacular leaves are green with a fuchsia center surrounded by white. Its rib is black. They require high humidity (more than 50% -- some cultivars want more than others), porous planting mix, a shallow pot, heavy fertilization during growth, and care to avoid overwatering. Once you hit the proper combination of growing conditions, the stunning color display will make it worthwhile. Your watering technique should permit the soil surface to become almost dry between waterings. Provide plenty of light without putting the plants in direct, hot sun. Spring morning sun or filtered sunlight may be acceptable in mild areas. If light comes from one side, give each plant a quarter turn weekly. Rex begonias do best if day temperatures hovers around 70°F and 60° at night. If it is cooler, they usually will survive but growth will be slow. In fall or winter, unless grown under lights, many cultivars enter dormancy – they stop growing and might even drop some or all of their leaves. If this happens, water only sparingly until spring, when new leaves will emerge.