Begonia 'Black Velvet' (black velvet rex begonia) care

Light

Begonia 'Black Velvet' 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 filtered light keeps the dark leaves deeply pigmented and the plant compact. Direct sun scorches the velvety surface, while low light causes leggy, paler growth. A phone lux-meter at the leaf surface should read 1,500-3,000 lux at noon.

Watering

Water begonia 'black velvet' when the top 2-3 cm of mix is dry, roughly every 5-7 days. 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. Water around the base to keep the crown dry and let excess drain. Rex begonias rot if overwatered, so allow the surface to dry slightly between waterings and cut back in winter when growth slows.

Soil and pot

Begonia 'Black Velvet' grows best in light, airy, free-draining houseplant mix. Use a peat-free or coir mix lightened with perlite and fine bark. The rhizome should rest on the surface, and the mix must drain freely to prevent rot. 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 'Black Velvet' sits happiest at around 50-70% humidity and 18-24°C (64-75°F). Prefers above-average humidity for full, unblemished leaves. Use a pebble tray or grouping; avoid misting the velvety foliage directly, which encourages mildew and leaf spotting. 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 'black velvet' sparingly. Feed every 3-4 weeks in spring and summer with a balanced liquid houseplant fertiliser at half strength. Stop feeding in autumn and winter during dormancy. 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 'black velvet' in the Growli community. Each is annotated with the most common cause so you know where to start.

• Powdery mildew — Rex begonias are mildew-prone in stagnant, humid air. Improve airflow, keep foliage dry, and remove affected leaves.
• Leaf scorch — Direct sun burns and fades the dark velvety leaves. Move to bright indirect light.
• Rhizome and crown rot — Overwatering or a buried rhizome causes soft, blackened rot. Keep the rhizome surface-set and let the topsoil dry between waterings.
• Winter leaf drop — Rex begonias may shed leaves and semi-dormant in winter. Reduce water, hold off feeding, and keep them warm; fresh growth returns in spring.

Propagation

Propagate from leaf cuttings (whole-leaf pinning or wedge cuttings) or rhizome sections in a warm, humid propagator. Plantlets form at the cut veins and can be potted on once rooted. 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 'Black Velvet' is toxic to pets. The ASPCA lists Begonia as toxic to cats and dogs. The toxic principle is soluble calcium oxalates, most concentrated in the rhizome; ingestion can cause oral burning, hypersalivation, vomiting and trouble swallowing. Keep away from pets. 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 'Black Velvet' deep-dive guides

Every aspect of begonia 'black velvet' care, each with its own calibrated guide:

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

Featured in these plant shortlists

Begonia 'Black Velvet' 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 'Black Velvet' is also commonly called black velvet rex begonia or dark 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