Source: Wikimedia Commons
Iron Cross Begonia
IntermediateBegonia masoniana
A rhizomatous begonia whose puckered green leaves bear a dark brown cross-shaped mark in the centre. The leaf surface is textured and covered in reddish hairs. It is native to southern China and northern Vietnam.
About
Begonia masoniana is a rhizomatous begonia native to southern China (Guangxi) and northern Vietnam. It was described from cultivated plants of unknown origin and only much later rediscovered in the wild. The common name 'iron cross' refers to the dark brown cross-like marking in the centre of each leaf. The epithet honours L. Maurice Mason, who brought the plant from Singapore to England in 1952. Plants grow to about 50 cm, with large asymmetrical, textured leaves covered in reddish hairs. Small white flowers are borne in upright panicles, but it is grown for its foliage. Although sometimes treated as a Rex begonia, it belongs to the separate section Coelocentrum, and it should not be confused with the similar Vietnamese B. variegata. It holds the RHS Award of Garden Merit. Pot plants are sold in ordinary Japanese garden centres and online. Keeping the leaves dry helps prevent powdery mildew.
Source: Wikipedia (CC BY-SA 4.0)
Size of the Iron Cross Begonia
The Iron Cross Begonia grows to 30-50 cm tall.
Temperature & humidity for the Iron Cross Begonia
The ideal temperature for the Iron Cross Begonia is 21〜23℃.
Basic Info
Origin
Southern China (Guangxi) and northern Vietnam
Lifespan
Perennial
Size
30-50 cm tall
Temperature
21〜23℃
Humidity
50〜70%
Watering & Fertilizer
Dilute liquid feed in the growing season
Growing Tips
Light & Placement
Bright indirect or filtered light, such as an east, south or west window.
Watering
Keep evenly moist while growing; when growth slows, let the surface nearly dry before watering. Keep water off the leaves.
Temperature & Overwintering
Prefers about 21-23°C and will not survive below about 13°C. Keep it in a warm room in winter.
Soil & Repotting
Use a moisture-retentive mix but avoid waterlogging. Raise humidity by standing the pot on a tray of wet gravel.
Propagation
Propagate by stem or leaf cuttings.
Pests & Cautions
Keeping the leaves dry helps prevent powdery mildew. Also watch for bacterial leaf spot, crown rot, aphids, mealybugs and spider mites. Begonias contain soluble oxalates that can cause vomiting and drooling in dogs and cats.
Iron Cross Begonia FAQ
QWhat is the growing difficulty level for Iron Cross Begonia?
Intermediate. A variety suitable for intermediate growers. Requires some cultivation experience and knowledge of environment management. Pay careful attention to temperature and humidity control.
QWhat is the ideal temperature for Iron Cross Begonia?
The ideal temperature for Iron Cross Begonia is 21〜23℃. Avoid sudden temperature changes and maintain a stable environment.
QHow large does Iron Cross Begonia get?
The mature size of Iron Cross Begonia is 30-50 cm tall. This may vary slightly depending on cultivation environment and individual differences.
QHow should I water and fertilize Iron Cross Begonia?
Iron Cross Begonia: watering & fertilizer — Dilute liquid feed in the growing season. Aim for appropriate frequency and amount.
QWhat is the typical price for Iron Cross Begonia?
The price of Iron Cross Begonia varies significantly by variety, characteristics, size, and lineage. Please check GrowerDirect's price guide for the latest market information.
Last updated: September 23, 2026
References & Sources
Edited & verified by: GrowerDirect Editorial Team
The classifications, regulations, and growing data on this page are created and verified based on the primary information database below.
Taxonomy & Authority
Regulations & Conservation Status
Not listed in the CITES Appendices. Not a designated invasive alien species in Japan, nor a nationally rare species under the Act on Conservation of Endangered Species.
Sources: Species+ (CITES listing check) / Ministry of the Environment: List of Invasive Alien Species
Regulations may change. Always verify the latest information with the relevant authorities.
Related Species
Find listings for this species
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