Plant guide
アルテルナンテラ
Watering rhythm
Every 3–5 days
Alternanthera is a compact foliage plant native to South America. It's prized for its vibrant leaf colors—reds, yellows, pinks, and more—with hues varying by variety. It's hardy and easy to care for, making it perfect for beginners. It grows neatly indoors without taking up much space.
Alternanthera prefers bright indoor conditions. Direct sunlight can scorch the leaves, so filtered light through a sheer curtain is ideal. It thrives at temperatures above 15°C; avoid anything below 10°C. Aim for humidity between 50–70%.
Light and temperature change a plant's metabolism, so the ideal cadence shifts with the seasons.
Spring
Every 2–4 days
Summer
Every 2–4 days
Autumn
Every 3–5 days
Winter
Every 5–7 days
Water thoroughly once the soil surface feels dry to the touch. Use your finger to check—when the soil no longer feels moist, it's time to water. Pour until water drains from the bottom of the pot, then discard any water in the saucer. Keeping the soil consistently wet invites root rot, so let it dry out between waterings.
Quick lookup from symptom to likely cause and action.
| Symptom | Likely cause | What to try |
|---|---|---|
| Leaf color becomes pale or fades | The plant likely isn't getting enough light, or it needs feeding. Alternanthera's colors are most vibrant with plenty of light. | Move it to a brighter spot—a window with filtered light through a sheer curtain is ideal. If needed, give it a diluted liquid fertilizer. |
| Stems grow long and leggy | Insufficient light causes the plant to stretch in search of brightness. Poor air circulation can also contribute. | Place it in a brighter location. Trim back overgrown stems to 5–10 cm from the tip to tidy up the shape. |
| Leaves turn yellow and the soil stays constantly wet | Overwatering has likely caused root rot. The longer root rot persists, the harder it becomes to reverse. | Water less frequently and allow the soil to dry out properly between waterings. If rot is advanced, consider repotting the plant. |
| Leaves turn brown and feel crispy | The air is too dry, or the plant is getting too much direct sun and burning. | Mist the leaves regularly to raise humidity. If it's in direct sun, filter the light with a sheer curtain. |
| White, cottony insects appear on the leaves | Mealybugs have moved in. They thrive in dry air and poor ventilation. | Gently wipe the bugs away with a soft cloth. For severe infestations, consider using an insecticidal spray. Improve air circulation to prevent them from returning. |
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