The Hanging Basket Begonias form smaller flowers than the upright type, but many more of them. A well-fertilized basket with several bulbs will be a true spectacle by mid-summer on your shady front porch. Growing Tuberous Begonias, a floral bonanza for shady areas. (See Combination Photo below.) Many gardeners consider these flowers the true aristocrats of the plant world. Once the treasured playthings of the very rich, these beauties are now easily available, and like most flowers with bulbous roots, are easy to grow. The bulbs are round and flat, sort of like a thickened cookie with a depression in the top.
One of the great advantages of tuberous begonias is that they do best in the shade. Like our garden impatiens, tuberous begonias can add lavish color in shady spots under trees or in pots on the patio. They require rich soil and regular feeding, so if you plant them in the ground, be sure to prepare the soil carefully.
Flower form. The most famous tuberous begonias, and certainly the most beautiful, are the camellia-flowered ones. One of the incredible bi-colored blooms plus a luscious white are shown in the large photo.
Hanging Basket Types are the ones with a draping, trailing habit. You see them at the garden center in baskets every spring. Growing your own is simple, and you can start them early. The flowers are smaller than the big potted ones, but more numerous.
Photo A shows how many people plant several bulbs in a large pot.
Photo B shows the spectacular result with a similar pot in full bloom. In fact, these "bulbs" are perfect for containers and window boxes, as long as they're protected from the blazing sun. 
Photo C shows how beautifully they perform in low, shady borders.
As you can see, the plants stay small, but the flowers are very large. In fact, your blooms may reach a spectacular 5" across with regular feeding. About 3-4" is the norm.
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Botanical Name: Begonia tuberhybridia pendula
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Common Name: Pink Hanging Basket Begonia
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Color: Clusters of multi-petaled, rich pink flowers
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Height: 10-12" - Cascading
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Spread/Width: Plant 3 bulbs per sq ft.
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Bloom Time: Mid summer until frost
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Sun/Shade: Partial to full shade
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Soil Preferences: Begonia's prefer a loose, rich, fertile soil that is well drained.
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Advantages: Grows and blooms rapidly. Adds color to patio pots and porch baskets
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Used For: Hanging Baskets or Patio Pots
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Zones: All Zones. When frost threatens, empty baskets, then dry and save tubers for next spring.
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