Full Specimen Plate
Begonia rajah
Rajah Begonia
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Market Analysis
Begonia rajah Price Guide & Auction Value
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Before You Buy
Species-specific things to check when evaluating a listing
- Check for powdery mildew — a white dusty coating on leaf surfaces, especially in dry conditions; it spreads rapidly between plants
- Inspect for mealybugs at leaf axils and the underside of stems where they hide in white cottony deposits
- Rhizome begonias should show firm, healthy rhizome tissue — avoid plants with soft, discoloured rhizomes
- Most begonias ship well as leaf cuttings — if buying a cutting, ensure it has a healthy petiole and no signs of rot at the cut end
Begonia rajah Morphology
About Begonia rajah
Begonia rajah, described by Ridley, is a rare understory species from the humid lowland rainforests of Peninsular Malaysia — growing in deep shade on the forest floor in consistently warm, humid conditions, rooted in moist humus and leaf litter over rocky organic substrates with minimal light. Its foliage is large, strongly bullate leaves with a metallic olive-bronze to dark green upper surface bearing light green venation and subtle banding, the undersides rich red to burgundy. The stout, creeping rhizome anchors the plant firmly as leaves emerge in succession. Rajah shares its Malaysian forest-floor habitat with pavonina, another sought-after species from the same understory. The name 'Rajah' is Malay for ruler or king.
Native Range
Malaysia
Propagation Guide
How to Propagate Begonia rajah
3-5 months
Cultivar character is preserved through vegetative cuttings
Most rhizomatous begonias root readily from leaf sections or petiole cuttings placed on moist substrate. Keep warm and humid until plantlets emerge at leaf margins.
Care Guide
Begonia rajah Care Guide & Growing Conditions
Light, well-draining mix: 50% perlite, 30% potting compost, 20% orchid bark. Begonias are susceptible to root rot — excellent drainage is essential.
Allow the top half of the substrate to dry between waterings. Water at the base — wet leaves invite fungal problems. Reduce in winter.
50–70%. More tolerant of average indoor humidity than tropical aroids, but consistent moisture prevents crispy leaf margins.
Balanced liquid fertiliser at quarter strength every 2–3 weeks during the growing season. Do not feed in winter.
Every 12–18 months in spring. Begonias like shallow, wide pots that suit rhizomatous growth. Don't bury the rhizome.
Common Problems
Powdery mildew
Poor air circulation combined with high humidity
Improve airflow; avoid wetting leaves; treat with a dilute bicarbonate of soda spray
Botrytis (grey mould)
Overwatering, dead leaves left on plant, poor air circulation
Remove dead foliage promptly; increase airflow; reduce watering
Leggy stems
Insufficient light
Move to a brighter position — begonias need good indirect light to maintain compact growth
Rajah by Name
From humid lowland rainforest in Peninsular Malaysia, Begonia rajah produces large, heavily patterned leaves with a distinctive textured surface and colouration. Rajah is simply Malay for 'king,' which the species carries with some justification — it is a large-growing, impressively leafed plant by begonia standards. Medium humidity requirements, reasonable drainage, patience; it tends to establish slowly but grows reliably once settled. Worth the upper middle tier it commands.
Also in: Iron-Cross & Bullate
Species with a raised, quilted leaf surface, including B. masoniana's namesake dark iron-cross marking.
