Acorus gramineus 'Ogon' - Golden Sweet Flag, Pond Marginal Plant
Acorus gramineus 'Ogon', known as golden sweet flag, forms low, arching fans of narrow golden-yellow leaves striped with green. It is semi-evergreen, so it keeps much of its colour through winter.
Golden sweet flag at a glance
| Botanical name | Acorus gramineus 'Ogon' |
|---|---|
| Common name | Golden sweet flag, slender sweet flag |
| Plant type | Low, clump-forming, semi-evergreen perennial |
| Height and spread | Up to 30 cm tall, up to 50 cm wide |
| Flowers | Tiny and insignificant; grown for its leaves |
| Position | Full sun |
| Soil | Wet or very moist fertile soil |
| Pond depth | 0–5 cm of water over the crown |
| Hardiness | RHS H6 – hardy in a very cold winter (-20 to -15°C) |
| Native to | East Asia (not UK native) |
Where to plant golden sweet flag
- The very edge of a pond, with no more than 5 cm of water over the crown
- Bog gardens and permanently moist borders
How to plant and care for it
Plant in spring or summer in wet soil or very shallow water. Tidy old, brown leaves in early spring and divide every few years to stop clumps becoming congested. The RHS notes it can be short-lived in water that stays above 22°C for long periods.
Which size should I buy?
Bare-root plants (7 cm, 9 cm, 1 litre and 3 litre) arrive without a pot or compost and are the most economical way to plant a group. Potted plants (9 cm, 1 litre and 3 litre) arrive growing in our peat-free compost and give a faster display. Packs of 3 come in 7 cm, 9 cm, 1 litre and 3 litre bare-root sizes and cost less per plant. The 2x Pot & Compost option is two plants supplied with pots and compost.
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