Polka dot begonia

Lucerna begonia

Larger plant overall (up to 2 m), pink rather than white flowers, smaller and lighter silver spots. Often cross-pollinated with B. maculata in commerce — provenance is mostly cultivar-level.

Scarlet angel-wing begonia

Plain (unspotted) wing-shaped leaves; vivid scarlet pendulous flowers. Same cane growth habit but a completely different leaf appearance.

Eyelash begonia / rhizomatous begonia

Rhizomatous (not cane), much smaller, with bronze-and-green tiger-striped leaves. Very different growth habit and visual.

Bright indirect — no direct midday sun.

Begonia maculata grows at the edge of forest gaps in southeastern Brazil. Indoors, place 30–80 cm back from an east window, or further back from a south or west window with a sheer curtain. Direct midday sun bleaches the silver spots and crisps the leaf edges within hours. In low light, internodes stretch and silver spotting fades — the species is one of the more reliable indicators of insufficient light when comparing rooms.

Seasonal: Nordic winters: a small grow light prevents winter leaf drop in dim apartments and keeps spotting vivid.

When the top 2 cm of soil is dry — every 5–10 days in growth.

Water thoroughly until water runs from the drainage holes, then empty the saucer. Allow the top 2 cm of soil to dry between waterings; constantly soggy soil is the leading cause of stem rot in cane begonias. Water from below or pour around the rim — do not let water sit on the leaves, which encourages powdery mildew. Use room-temperature filtered or rainwater.

Seasonal: Reduce frequency in winter; the plant uses much less water and is more vulnerable to rot in cool soil.

Loose, well-draining, slightly acidic with high organic content.

A 2:1:1 mix of quality indoor potting soil, perlite, and orchid bark drains well while retaining enough moisture between waterings. African violet mix works directly. Avoid heavy or compact mixes — cane begonias have shallow fleshy roots that suffocate easily.

50–70 % ideal; powdery mildew rises above 75 % with poor airflow.

B. maculata wants moist Brazilian-rainforest air. Below 40 %, leaf edges crisp and lower leaves drop. Above 75 % with stagnant air, white powdery mildew settles on leaves within days. The sweet spot is a humidifier set to 55–60 % combined with a small fan or open doorway providing gentle air movement. Do not enclose under a cloche — too humid for this species.

Seasonal: Nordic winters: humidifier essential; without one the plant typically drops 30–50 % of its leaves in deep winter.

18–26 °C; damage below 13 °C.

Tropical species — does not tolerate cold drafts or temperatures below 13 °C. Brief exposure to cold causes leaf drop and blackened patches. Keep clear of unheated entryways, away from glass on cold winter nights, and out of the path of air-conditioning vents.

Half-strength balanced liquid feed every 2–3 weeks in spring and summer.

Begonias are moderate-to-heavy feeders during the growing season. A balanced liquid fertiliser (e.g. NPK 10-10-10) at half the label rate every 2–3 weeks from April through September supports vigorous growth and continuous flowering. Switch to a higher-phosphorus formulation (e.g. 5-10-5) to encourage flowering if growth is overly leafy.

Seasonal: Skip feeding from October through March; growth pauses.

Pinch growing tips at 30–40 cm to encourage branching; cut back leggy canes.

Cane-type begonias do not branch unless tipped or pruned. Pinch the growing tip when a cane reaches 30–40 cm to activate dormant buds at lower nodes — within 4–6 weeks two or three new shoots emerge below the cut. Hard prune leggy plants back by half in early spring; the cane regrows multiple new shoots from the lowest few nodes. All pruning offcuts root readily as cuttings.

Every 1–2 years in spring; prefers to be slightly pot-bound.

Move up by a single pot size when roots fill the pot or when the plant becomes top-heavy. Begonia maculata flowers more reliably under modest root restriction. Take care with the brittle fleshy roots — broken roots invite rot. A heavy ceramic pot suits the top-heavy cane habit and prevents toppling.

Soluble calcium oxalates cause mouth and throat burning, salivation, and GI upset on ingestion. Significant ingestion is uncommon in adults; rinse the mouth and seek medical advice if a child ingests plant material.

ASPCA lists Begonia as toxic to cats. Soluble calcium oxalates cause mouth burning, drooling, vomiting, and difficulty swallowing on ingestion. Less acute than insoluble-oxalate Araceae like dieffenbachia or monstera but still requires veterinary attention if substantial amounts are eaten.

Mechanism: soluble calcium oxalates

ASPCA lists Begonia as toxic to dogs. Same soluble calcium oxalate mechanism — mouth irritation, drooling, vomiting, and rarely kidney damage with large ingestions of tuberous parts. Contact a vet if a dog has chewed substantial plant material.

Mechanism: soluble calcium oxalates