Begonias are grown from tubers, and can be used either indoors or in the garden once all signs of frosts have disappeared. There are several types of Begonias that can be grown from tubers. There are also Begonias that are grown on a fibrous root system - but not for this section on bulbous plants.
The range of flower types and flower colours available, make this an important group of plants for the garden in particular.
The most important group of tuberous begonias for garden use - or indoors - is the Begonia Tuberhybrida group. This includes all of the begonias in the image, and most of the large double and single flowered begonias that are sold for garden use.
There are many flowering types within this group, including large double flowered Begonais, Picotee, Fimbriata, Non-stop etc. They are all available as dormant tubers in early spring. If you miss out on these, then they are also available as small plants in late spring.
Increasing in popularity are the group of Begonias known as either Begonia pendula, or simply hanging begonias. These are suitable for hanging baskets and the edges of planted containers on the patio.
The other main groups of begonias suitable for growing from tubers for outside use, are the begonia multiflora group. These can consist of either small single, semi-double or fully double flowers. They should not be confused with those sold as 'Non-Stop' Begonias, which - once in flower - will carry on until early Autumn.