9 Sep.—
A small citrus that carries fruit almost continuously – green, then orange, and sour at every stage.
The name is certain. Nothing else in a Thai garden produces a thin-skinned citrus fruit that small on a shrub that size.
Calamansi
Citrus × microcarpa
Plate I.
The particulars
Also called
ส้มจี๊ด, calamansi, calamondin, Philippine lime
Soil
Free-draining and slightly acidic. It resents heavy soil that holds water around the roots.
Family
Rutaceae
Toxicity
The fruit is eaten. The peel oil can irritate skin in sunlight, and citrus oils upset cats and dogs if chewed.
Light
Full sun. Less than about six hours and it keeps its leaves but stops setting fruit.
Found
—
Water
Keep the soil evenly damp. Letting it dry out completely is the usual reason the small fruit drops before ripening.
Named from
en.wikipedia.org, powo.science.kew.org
Certainty
High
Named on
9 September 2026
Notes on keeping it
It fruits and flowers at the same time for most of the year, so there is rarely a good moment to prune hard – take out crossing branches when you see them instead.