Plant guide
アスプレニウム
Watering rhythm
Every 3–5 days
Aspleniums are ferns known for their delicate, feathery fronds. Native to tropical and subtropical humid environments, they're popular as beginner-friendly houseplants. They handle low light well and bring a graceful, gentle presence to any space.
Bright, indirect light is ideal. Keep them away from direct sun—a spot near a window with sheer curtains or a well-lit room works perfectly. Aim for temperatures between 15–25°C, and try to maintain humidity above 50%. Avoid placing them where air conditioning or heating vents blow directly on them.
Light and temperature change a plant's metabolism, so the ideal cadence shifts with the seasons.
Spring
Every 2–4 days
Summer
Every 2–3 days
Autumn
Every 3–5 days
Winter
Every 5–7 days
Water thoroughly once the soil surface feels dry. The goal is to keep the soil consistently moist without letting it stay waterlogged—water until it drains from the bottom of the pot to prevent root rot. Misting the fronds regularly helps keep them vibrant and guards against pests and disease.
Quick lookup from symptom to likely cause and action.
| Symptom | Likely cause | What to try |
|---|---|---|
| Fronds turning brown and crispy | The air is too dry, or the plant is getting direct sunlight. Ferns love humidity. | Move it to a spot with bright, indirect light and mist the fronds daily. If you have a humidity meter, try to keep levels at 50% or higher. |
| A foul smell coming from the base | Root rot from overwatering or poor drainage. Staying constantly wet creates ideal conditions for it. | Take the plant out of its pot and gently remove any blackened, rotting roots by hand. Repot in fresh soil and ease back on watering—let the soil surface dry slightly between waterings. |
| Yellowing fronds that are dropping from the bottom | Not enough light, the pot may be too small, or the plant is lacking nutrients. | Move it to a brighter spot. In spring, size up to a slightly larger pot—this often helps. Try feeding it with diluted liquid fertilizer once a month. |
| Tiny insects on the undersides of fronds | Scale insects or aphids. High humidity can encourage them. | Gently wipe the fronds with a soft cloth. For heavier infestations, spray with diluted neutral soap or use a general-purpose houseplant insecticide. |
| New fronds are small and growth has slowed | Root bound conditions, low nutrients, or insufficient light. It may be time to repot. | In spring, repot into fresh soil in a pot one size larger. Feed monthly with diluted houseplant fertilizer for best results. |
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