Sweet flag (Acorus calamus)
Care, watering, light and tips for Sweet flag on Floravia.
Quick facts
- Family: Acoraceae
- Difficulty: Moderate care
- Watering: every 3 days
- Light: Partial shade
- Temperature: 10–30 °C
- Toxicity: Toxic to pets
About Sweet flag
Acorus calamus, commonly known as sweet flag, is a perennial aquatic plant featuring long, sword-shaped leaves that emit a distinctive aroma when crushed. Its bright green, upright foliage makes it perfect for pond edges, water gardens, or even submerged pots, adding a touch of freshness and natural beauty.
Native range
Asia, from India and Sri Lanka to Japan and Korea, and also southern Russia and Eastern Europe.
Care tips
It thrives in full sun to partial shade and requires consistently moist to submerged soil in shallow water. Ensure the substrate is rich and organic, ideally an aquatic plant mix. Watering should be abundant and continuous, preventing the soil from drying out completely. A common mistake is planting it in dry soil, which will lead to its rapid decline.
How to save a dying Sweet flag
- Warning signs
- Yellowing leaves from tips, drying out, or rotting at base. Stunted growth.
- First aid
- Check water. Ensure constant moisture, but no standing water. Prune affected leaves.
- What kills it
- Drying out from lack of water or rotting from excess water. Doesn't tolerate drought.
- Can it be saved?
- Yes, if you act quickly. It needs precise water balance. It can recover.