Plant guide
ハイビスカス
Watering rhythm
Every 3–5 days
Hibiscus is a tropical plant prized for its stunning blooms in shades of red, pink, yellow, and beyond. It's remarkably easy to grow and a favorite with beginners. As an evergreen, it thrives in warm, bright conditions and will reward you with flowers throughout the growing season.
Place your hibiscus where it receives at least 6 hours of direct sunlight daily—this is the sweet spot for blooming. Keep temperatures above 15°C, ideally 20°C or warmer. Aim for humidity around 50–70%, and good air circulation will help it stay healthy and happy.
Light and temperature change a plant's metabolism, so the ideal cadence shifts with the seasons.
Spring
Every 2–4 days
Summer
Every 1–3 days
Autumn
Every 3–5 days
Winter
Every 5–8 days
Water thoroughly when the top of the soil feels dry to the touch; you'll know you've watered enough when water drains from the bottom of the pot. During summer, evaporation speeds up, so check the soil daily—it may dry out faster than you'd expect. In winter, growth slows, so ease back on watering a bit. Always empty any water sitting in the saucer beneath the pot.
Quick lookup from symptom to likely cause and action.
| Symptom | Likely cause | What to try |
|---|---|---|
| Buds dropping off | Sudden temperature swings, dry air, insufficient light, or overwatering can all stress your plant. Hibiscus is sensitive to abrupt environmental changes. | Keep temperatures at 15°C or above and ensure at least 6 hours of direct sun daily. Water only after the soil has dried out, and try to keep conditions as stable as possible. |
| Yellowing leaves that fall off | Overwatering leading to root rot, cold drafts in winter, or poor light are the usual culprits. When roots are damaged, the plant can't absorb nutrients properly. | Check your soil moisture and hold off on watering until it dries out. If it's cold, move the plant to a warmer spot and improve its light exposure. |
| Few or no flowers, sparse buds | Inadequate light, too much nitrogen fertilizer (which encourages leaves over flowers), or temperatures that are too cool in winter can all prevent blooming. | Move your plant to a brighter location with at least 6 hours of direct sun daily. During the active growing season (spring and summer), feed monthly or every other month with a fertilizer higher in phosphorus and potassium. |
| Leaves look white or feel sticky | Scale insects or spider mites are likely to blame. They multiply quickly in summer or where air circulation is poor. | Gently wipe the leaves with a damp cloth. If the infestation is spreading, use an insecticide spray. Improve air circulation around the plant and mist the leaves regularly to prevent drying out. |
| Stems feel soft and mushy | A combination of cold temperatures and excess moisture has triggered stem rot and root decay. Poor-draining soil can make this worse. | Stop watering immediately and raise the temperature around your plant while improving air flow. Use clean scissors to remove any rotted sections, and repot in fresh soil to give it the best chance of recovery. |
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