Bring on the blooms with Mistral Yellow begonia. This sunny beauty is a type of Begonia boliviensis, which pumps out flowers all summer long. Showcase Mistral Yellow in a hanging basket or tall container. Plants form tubers that overwinter easily in the pot. Slip the pot into a non-freezing, cool, dark location for winter. Barely water once a month. Tubers start sprouting in spring, signaling it’s time to move the plant into bright light.