The Begonia Tuberous Mix Bulbs should be placed in small Planters, Pots, Tubs, Urns and Window boxes. Use a 6-inch (15.2 cm) pot for one or two small, 1 to 3-inch (2.5 to 7.6 cm) diameter bulbs or one larger bulb. Use a 10-inch (25.4 cm) pot or basket for three small bulbs.