How to Care for Begonia Plants? | Growing Basics That Work

Most begonias fail from one of two habits: watering on a fixed schedule and leaving the crown wet. The fix is simpler than most guides admit. Let the top inch of soil dry out, water at the soil line, and keep the leaves as dry as you can. That single approach does more for a healthy plant than any fertilizer or fancy potting mix. The sections below cover the light, water, soil, and feeding details that keep begonias flowering for years, plus the mistakes that send them into decline.

What Kind of Light Does a Begonia Need?

Begonias want bright, indirect light or part shade. The Royal Horticultural Society notes they need good light to grow sturdy stems and produce flowers, but direct sun can scorch the leaves.

A spot near an east-facing window, or a few feet back from a south- or west-facing one, usually works. If the leaves turn pale or the stems stretch toward the window, the plant is asking for more light. If the leaf edges crisp up or bleach, the sun is too strong.

How Often Should You Water a Begonia?

Water when the top inch of soil feels dry to the touch — some growers wait until the top 1–2 inches dry out. Then water thoroughly at the soil line until it drains from the bottom, and let the pot never sit in standing water.

This is where most problems start. Soggy soil leads to root rot, and wet foliage invites leaf spot and fungal disease. Water at the base of the plant, not over the leaves or crown. In late fall and winter, when growth slows, cut back on watering and let the soil dry a bit more between drinks.

Soil, Humidity, and Temperature Preferences

Use a well-draining potting mix. A peat-free multipurpose compost or a quality all-purpose potting blend works well, and the container must have drainage holes.

Begonias like medium to high humidity, but the RHS warns against misting — begonia mildew thrives in damp conditions. Instead, set the pot on a tray of gravel or expanded clay granules with water below the pot’s base to raise humidity without wetting the leaves. The RHS lists a preferred temperature range of 58–72°F (15–22°C) for houseplant begonias, with a winter minimum of 55°F (13°C) for most types. Some groups, like the rex begonias, also need that 55°F winter minimum rather than a cooler rest.

Feeding, Pruning, and Repotting Begonias

Feed begonias during active growth in spring and summer, not in winter dormancy. The RHS recommends a high-potassium plant food from May to September for houseplant begonias. A balanced liquid fertilizer every 2–4 weeks at half strength is a common rhythm, but adjust to your plant’s growth rate and the light it receives.

Pinch back stem tips to encourage a bushier plant, and remove dead or yellowing leaves as they appear. Most begonias are self-cleaning, so deadheading is rarely necessary. Repot every 1–2 years in spring, or when roots fill the pot. If you’re ready to add a silver begonia variety for your collection, our roundup of tested options is a good starting point.

Here’s a quick reference for the core care routine:

These routines match the guidance from the RHS’s begonia houseplant care page, which is a reliable reference for UK and US growers alike.

FAQs

Why Are My Begonia Leaves Turning Yellow?

Yellow leaves usually mean overwatering or poor drainage. Check that the pot has drainage holes and that the soil isn’t staying soggy. Let the top inch dry out before watering again. If only the lower leaves yellow and the plant is otherwise healthy, it may be a normal part of aging.

Can Begonias Tolerate Direct Sunlight?

No, most begonias prefer bright, indirect light or part shade. Direct sun can scorch the leaves, causing brown or bleached patches. Place them near an east window or a few feet away from a brighter one to give them strong light without the burn.

Should I Mist My Begonia to Increase Humidity?

No, the RHS explicitly advises against misting begonias. Wet foliage encourages mildew and fungal leaf spots. Instead, raise humidity by placing the pot on a tray of wet gravel or expanded clay granules, keeping the water level below the pot’s base.