Begonia grandis is a plant

Plant

Plants are living organisms belonging to the kingdom Plantae. Precise definitions of the kingdom vary, but as the term is used here, plants include familiar organisms such as trees, flowers, herbs, bushes, grasses, vines, ferns, mosses, and green algae. The group is also called green plants or...

 in the begonia family, Begoniaceae

Begoniaceae

Begoniaceae is a family of flowering plants with about 1400 species occurring in the subtropics and tropics of both the New World and Old World. All but one of the species are in the genus Begonia. The only other genus in the family, Hillebrandia, is endemic to the Hawaiian Islands and has a single...

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Description

Begonia grandis is a herbaceous plant

Herbaceous plant

A herbaceous plant is a plant that has leaves and stems that die down at the end of the growing season to the soil level. They have no persistent woody stem above ground...

 with alternate, simple leaves

Leaf

A leaf is an organ of a vascular plant, as defined in botanical terms, and in particular in plant morphology. Foliage is a mass noun that refers to leaves as a feature of plants....

, on arching stems. The flowers are pink or white, borne in fall. As the common name "Hardy Begonia" implies, it is one of the hardiest species or cultivars of Begonias. At least it can hibernate well in　Hardiness zone

Hardiness zone

A hardiness zone is a geographically defined area in which a specific category of plant life is capable of growing, as defined by climatic conditions, including its ability to withstand the minimum temperatures of the zone...

9a in Southwestern Japan as bulbs or bulbils (bulbils are formed in axils). Other parts of the plant eventually wither to death as temperature lowers.