Not a true begonia at all, Pellionia repens is a compact trailer whose oval leaves carry a dark-edged, watermelon-like pattern, a lush, easy cascader for terrariums and vivariums.
Light
Bright, indirect light suits it best; direct sun scorches the leaves while deep shade makes it leggy.
Water & humidity
Keep the substrate consistently moist, it should never dry out fully, and give it high humidity, which a terrarium provides naturally.
In the terrarium
An excellent closed-terrarium trailer. Its compact, spreading habit suits enclosed spaces, spilling over hardscape and rooting as it creeps.
Origin & temperature
Pellionia repens comes from Southeast Asia (including Vietnam and Malaysia), trailing across the warm, humid forest floor, despite its common name it belongs to the nettle family, not the begonias.
Temperature: 18–27 °C. Pet safety: not known to be toxic, but best kept out of reach.
Propagation
Easy from stem cuttings laid on damp substrate; they root quickly from the nodes.
Common problems
- Leggy growth = too little light; move somewhere brighter.
- Crisping leaves = it dried out or humidity dropped; keep moist and humid.
Good companions
Trailing Watermelon Begonia pairs well with plants that want the same conditions, a humid, closed terrarium with bright, indirect light. Here are some species that thrive alongside it:
→ Explore more matches with our Plant Pairing Tool.
Frequently asked questions
Is it really a begonia?
No, despite the common name it's Pellionia repens, in the nettle family. The 'watermelon' refers to the leaf pattern, not a relation to begonias.
Is it good for a closed terrarium?
Yes, it's compact, humidity-loving and trails attractively, making it a great fit for closed terrariums and vivariums.
Care information is a general guide; conditions vary. Some links on this site are affiliate links that help support Terrarium Creations.