Plant guide
シマトネリコ
Watering rhythm
Every 5–7 days
Island Tree is a compact tree native to Okinawa, known for its delicate stems and feathery, bright green foliage. It's wonderfully resilient and adapts well to indoor conditions, making it an excellent choice for beginners. This plant brings a fresh, airy feel to any room.
Bright, indirect light is ideal—think of a well-lit spot near a window, but away from direct sun. Keep temperatures between 15–25°C (59–77°F), with a minimum of 10°C (50°F). Aim for humidity levels around 50–70% to prevent the air from becoming too dry.
Light and temperature change a plant's metabolism, so the ideal cadence shifts with the seasons.
Spring
Every 4–6 days
Summer
Every 3–5 days
Autumn
Every 5–7 days
Winter
Every 8–12 days
Water thoroughly whenever the soil surface feels dry—let water flow through the drainage holes at the bottom of the pot, then discard any excess from the saucer. If the leaves start to look slightly droopy, that's your cue to water. Be careful not to overwater; prolonged moisture in the soil can lead to root rot. Strike a balance between dry and soggy.
Quick lookup from symptom to likely cause and action.
| Symptom | Likely cause | What to try |
|---|---|---|
| Leaves turn yellow and drop | Overwatering causing root rot, or sudden drops in temperature. Winter watering is often the culprit. | Cut back on watering immediately and move the plant to a spot with better air circulation. If the roots have turned black, consider repotting. |
| Leaves look pale and thin | Not enough light. Keeping the plant in a dark corner will gradually sap its vigor. | Move it to a brighter spot near a window. Aim for at least 2 hours of good light each day. |
| Stems become thin and leggy | Insufficient light causing the plant to stretch upward in search of brighter conditions. | Relocate to a brighter area. Trim back overgrown stems at the base to encourage a bushier shape. |
| White powder on leaves or visible insects | Spider mites, whiteflies, or powdery mildew—these thrive in dry indoor environments. | Wipe the leaves gently with water to remove pests. For severe infestations, spray with diluted dish soap or use a plant-safe insecticide. |
| Soil dries out very quickly | The roots have filled the pot entirely, reducing the soil's ability to retain moisture. | In spring, repot into a slightly larger container with fresh soil to give the roots more room and restore water retention. |
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