begonia

There are over 1,000 species of begonia native to tropical and subtropical regions of Central and South America, Asia, and Sub-saharan Africa. The rhizomatous (including rex) and cane varieties are most commonly grown as houseplants.

Light: Cane varieties prefer bright, indirect light, while the rhizomatous, and Rex/rhizomatous varieties do well with medium light levels.

Water: Balance is key here, as is soil choice. They prefer to remain moist, but the roots mustn’t stay too wet; susceptible to root rot. Water below the leaves to avoid powdery mildew.

Humidity: High humidity. Place on a pebble tray, but DO NOT MIST. Begonias are prone to powdery mildew, so minimize wetting the leaves.

Soil: Preferably a soil-less mix of peat moss and perlite/vermiculite. The goal is good drainage with a little moisture retention.

Nutrients: Liquid houseplant fertilizer once monthly during the growing season.

Pests/Disease: Highly susceptible to root rot, powdery mildew, and botrytis when kept in too damp conditions. Check for mealybugs.

Toxicity: Slightly toxic to pests. Calcium oxalates act as an oral and digestive irritant when ingested.

Notes: Begonias enjoy being a little rootbound, but can benefit from a repotting in the spring to give room for growth.