Unusual, eye-catching, and a true collector’s gem, Begonia amphioxus is known for its narrow, lance-shaped leaves dotted with vivid red spots. With a bamboo-like stem and elegant upright growth, this tropical begonia brings bold personality to any bright indoor space. Not the easiest begonia to grow, but certainly one of the most rewarding when given the right conditions.

Scientific Name
Begonia amphioxus (amphioxus = “both ends alike” in Greek – a reference to the leaf shape)

Common Name(s)
Polka Dot Begonia, Bamboo Begonia (informal), Spotted Lance Begonia

Origin
Endemic to limestone cliffs in Borneo (Sarawak, Malaysia) – often grows in humid, shaded microclimates

Light
Bright, filtered light is essential. Avoid harsh direct sun, which can scorch the delicate foliage. Will stretch and lose colour in deep shade.

Water
Keep soil lightly moist but never soggy. Water when the top 1–2cm feels dry. Use room-temperature water and avoid letting it fully dry out, especially in warm conditions.

Humidity
Loves high humidity – ideally 60–80%. Best grown in a terrarium or with a consistent humidity source like a pebble tray or humidifier.

Soil
Use a very well-draining, airy mix – a blend of orchid bark, perlite, and a small amount of peat or coir works well. Avoid heavy, moisture-retentive composts.

Food
Feed every 3–4 weeks during spring and summer with a gentle, diluted fertiliser. Avoid overfeeding – too much can damage the roots.

Temp
Prefers warmth – 18–26°C. Very sensitive to cold and draughts. Keep above 16°C at all times.

Pet-safe
Toxic if ingested – keep out of reach of pets and small children.

Sprouts Top Tips
This plant thrives in a covered environment – a glass cabinet or terrarium is ideal for maintaining the warmth and humidity it needs to stay happy.

Extras
Begonia amphioxus can become leggy with age – prune gently to encourage bushier growth and propagate stem cuttings in high humidity.

Did You Know?
This species was only formally described in 1990 and is considered rare both in the wild and in cultivation. It’s often grown by begonia enthusiasts and botanical collectors due to its unusual shape and markings.