Begonia Care Guide

The Ultimate Begonia Care Guide

Begonias are having a moment — and it's well deserved. Once dismissed as a garden centre staple, the houseplant world has woken up to just how extraordinary this genus really is. From the metallic, jewel-toned foliage of rex begonias to the cascading cane types and the increasingly rare collector specimens, Begonias are endlessly varied and genuinely addictive.

Light

Most Begonias thrive in bright, indirect light. Foliage types (like rex begonias) can handle slightly lower light than flowering varieties, but all will perform best with good, consistent brightness. Avoid harsh direct sun — it will bleach and scorch those often-spectacular leaves. An east-facing window or a spot set back from a south-facing window is ideal. In winter, move them closer to the light source.

Watering

Begonias like to be watered when the top inch or two of soil is dry — they want moisture but absolutely cannot tolerate waterlogged roots. Water at the base rather than over the leaves where possible, as wet foliage can encourage powdery mildew. Terracotta pots are a great choice for Begonias as they help regulate moisture. In winter, reduce watering significantly.

Humidity & Temperature

Here's the nuance: Begonias appreciate humidity, but they don't want it on their leaves. Aim for 50–60% ambient humidity using a humidifier or a pebble tray with water — avoid misting directly onto the foliage. Keep temperatures between 16–24°C and away from cold draughts. They're not frost-hardy and will suffer below 10°C.

Soil & Potting

A light, well-draining mix is essential — Begonias hate heavy, dense soil. A blend of potting mix, perlite, and a little coco coir works well. They prefer to be slightly root-bound, so don't rush to repot — move up one size only when roots are clearly escaping. Spring is the best time.

Feeding

Feed every 2–4 weeks during the growing season with a balanced liquid fertiliser. For flowering varieties, switch to a potassium-rich feed to encourage blooms. Stop feeding in autumn and winter when the plant is resting.

Common Issues

Powdery mildew: The most common Begonia problem — caused by poor air circulation and wet leaves. Improve airflow and avoid overhead watering. Yellow leaves: Overwatering or too little light. Leggy growth: Not enough light — move closer to a window. Leaf drop: Cold stress, draughts, or sudden environmental changes.

Begonias are a rabbit hole in the best possible sense. Start with one and you'll quickly find yourself deep in the world of rare cultivars, limited releases, and collector swaps. Welcome to the obsession.