Hardy begonias in pink, red, yellow and white come back every year from a corm. they are robust little plants with fleshy dark green leaves to cover a border, Ideal for window box because they will fill it out and last a long time with minimal watering. Choose trailing varieties for tubs, baskets and boxes. Choose upright varieties for borders. Picotee varieties have frilly edged petals and doubles provide very good value with their big blooms.