Begonias: Indoor Care, Species, and Propagation

Begonia is a large genus in the family Begoniaceae containing over 2,000 species, making it one of the largest flowering plant genera in cultivation. The genus spans an enormous range of growth habits, foliage types, and flowering characteristics, from compact wax begonias grown as bedding plants to large cane-type specimens with dramatic spotted or metallic foliage. Indoor begonias can be grouped into four main categories by growth habit, and understanding which type you have determines the care approach that will work best.

Growth Habit Categories

Cane-type begonias, often called angel wing begonias, produce upright, jointed stems and large, asymmetric leaves that are frequently spotted, metallic, or marked with contrasting colors on the underside. They grow tall and benefit from a pinching or pruning routine to maintain a bushy rather than leggy form. Begonia maculata is the most widely recognized cane-type.

Rhizomatous begonias, of which rex begonias are the most prominent, grow from a horizontal rhizome at or near the soil surface. They are grown primarily for their foliage, which can be extraordinarily varied in pattern, texture, and color, including combinations of silver, burgundy, green, and pink. Rhizomatous types do not grow as tall as cane-types and spread outward rather than upward.

Tuberous begonias grow from a fleshy tuber and typically go dormant in winter, losing their foliage and resting underground until spring. They are the most seasonally complex type to manage indoors and are less commonly grown as permanent houseplants than the cane and rhizomatous types.

Fibrous or semperflorens begonias (wax begonias) are compact, prolific-flowering plants most commonly seen outdoors as bedding plants. They can be grown indoors and tolerate a wide range of conditions, making them useful for low-light positions where other begonias would not thrive.

Shared Care Requirements

Most indoor begonias share a few consistent needs. Bright indirect light produces the best foliage color and the most flowering in species that bloom. Medium light is tolerated but growth slows and flowering reduces. Direct sun causes scorch on the large, thin leaves of cane and rhizomatous types.

Well-draining, moisture-retentive soil is important. Begonias do not tolerate waterlogged conditions: their fibrous or rhizomatous roots rot quickly in wet soil, but they also do not cope well with extended dry periods. The balance is to allow the top centimeter or two of mix to dry before watering.

Humidity above 50 percent benefits most begonias, particularly the rex types with their large decorative foliage. However, wetting the leaves directly risks fungal spotting: water at the base of the plant rather than from above, and do not mist the foliage.

Begonias are susceptible to powdery mildew, particularly cane-types grown in low airflow conditions. Good air circulation around the plant reduces risk significantly. For plant health problems including powdery mildew and pest management, the plant health problems hub links to the relevant diagnostic guides.

Guides in This Hub

The begonia care guide covers light, water, soil, and fertilizing in full for all indoor begonia types. For propagation by stem and leaf cuttings, the how to propagate begonias guide covers the full technique. The begonia leaves drooping or wilting guide addresses the most common distress signal in the genus.

Species guides: angel wing begonia care, begonia maculata care, and rex begonia care.

For readers choosing between begonia varieties, the best begonia varieties for growing indoors guide narrows the options by space, light, and care preference.