Begonia 'Looking Glass' (looking glass begonia) care

Light

Begonia 'Looking Glass' is what florists mean by "bright spot, no direct sun" — close enough to a south or east window to feel the brightness, with a sheer curtain or a few feet of distance keeping the sun off the leaves. Bright, indirect light maximises the silver sheen; an east window or a few feet back from a brighter one is ideal. Direct sun scorches and fades the metallic colour, while deep shade leaves the foliage dull and leggy. A phone lux-meter at the leaf surface should read 1,500-3,000 lux at noon.

Watering

Water begonia 'looking glass' when the top 2-3 cm of soil is dry, every 5-7 days in growth. The actual day count varies with pot size, light, and season — the finger test (or lifting the pot to feel its weight) is more reliable than a fixed calendar. Empty any drainage saucer afterwards so the pot isn't sitting in water. Keep lightly and evenly moist but never wet; rex begonias are prone to root and crown rot. Water at the soil surface to avoid wetting leaves, and ease off in winter.

Soil and pot

Begonia 'Looking Glass' grows best in light, airy, free-draining mix. A peat-free potting mix with generous perlite or bark for aeration suits the shallow rhizome. Use a wide, shallow pot; heavy or waterlogged soil quickly rots the roots. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Begonia 'Looking Glass' sits happiest at around 50-70% humidity and 18-24°C (65-75°F). Rex begonias need higher humidity than average rooms provide; use a pebble tray, group with other plants, or run a humidifier. Avoid misting the leaves directly, as wet foliage invites mildew. If you keep the room above 18 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed begonia 'looking glass' sparingly. Feed every 2-4 weeks in spring and summer with a balanced liquid fertiliser at half strength. Rex begonias are light feeders, so avoid overfeeding; stop in winter. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on begonia 'looking glass' in the Growli community. Each is annotated with the most common cause so you know where to start.

• Powdery mildew — Rex begonias are especially mildew-prone; white film appears in humid, still air. Increase airflow and keep leaves dry.
• Crown and root rot — Overwatering or a buried rhizome causes soft, collapsing stems; keep the rhizome on the surface and let soil dry slightly between waterings.
• Winter leaf drop / dormancy — Short cool days trigger semi-dormancy and leaf loss; reduce water, keep warm, and wait for spring regrowth rather than overwatering.
• Faded silver colour — Metallic sheen dulls in too little or too much light; provide steady bright indirect light out of direct sun.

Propagation

Easy from leaf cuttings (whole-leaf, leaf-wedge, or leaf-vein methods) or rhizome division; keep cuttings warm and humid on moist compost until plantlets form. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Begonia 'Looking Glass' is toxic to pets. ASPCA-listed as toxic to cats, dogs, and horses. The genus Begonia contains soluble calcium oxalates, most concentrated in the underground rhizome; ingestion causes oral irritation, drooling, vomiting, and kidney failure in grazing animals. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Begonia 'Looking Glass' deep-dive guides

Every aspect of begonia 'looking glass' care, each with its own calibrated guide:

• Begonia 'Looking Glass' watering schedule
• Begonia 'Looking Glass' light requirements
• Best soil mix for begonia 'looking glass'
• Begonia 'Looking Glass' fertilizing guide
• When to repot begonia 'looking glass'
• How to propagate begonia 'looking glass'
• Begonia 'Looking Glass' growth rate & size
• Begonia 'Looking Glass' cold hardiness
• Begonia 'Looking Glass' temperature & humidity
• Is begonia 'looking glass' toxic to cats & dogs?
• Is begonia 'looking glass' toxic to cats?
• Is begonia 'looking glass' toxic to dogs?

Featured in these plant shortlists

Begonia 'Looking Glass' qualifies for 4 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best plants for a north-facing window — Houseplants for a north-facing window: bright, even, indirect light and no scorching direct sun. Each pick verified against its documented light needs.
• Best humidity-loving houseplants — Houseplants that thrive in a bathroom, kitchen, or by a humidifier — selected by documented humidity preference.
• Houseplants toxic to cats & dogs — The common houseplants the ASPCA lists as toxic to cats and dogs — the ones to keep out of reach, each with its symptoms and a safe alternative.
• Best small & tabletop houseplants — Compact houseplants that stay under about 40 cm — desk, shelf and windowsill plants that never outgrow a small space.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Begonia 'Looking Glass' is also commonly called looking glass begonia or silver rex begonia.

• Types of begonia — varieties identified, with care and pet-safety
• Snake plant care — light, water and common problems
• Dracaena care — light, water and common problems
• Peperomia care — light, water and common problems
• All 2464 plant care guides in the Growli library