Begonia plants have blooms that flower around mid summer and last until the first frost. Begonia blooms come in many colors, including red, white, yellow, pink and even multi-color. Begonias have underground root structures called tubers and in order for the plants to thrive, proper spacing is a must.
Plant begonia tubers just under the surface of the soil with the bud--or eye--facing up.
Space multiple begonias 6 inches apart. Most begonias plants grow to be 10 to 12 inches high and planting them 6 inches apart gives them plenty of room to grow.
Alternatively, plant larger begonia plants 12 to 18 inches apart. Some varieties can grow to be 18 to 36 inches tall, such as the red begonia (dragon wing) and therefore need more space to grow.