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.

Pond depth: 0 - 5cm

Light: Full sun

Hardiness: Hardy

Height and spread: 20 - 40cm tall, 30 - 50cm wide

Planting and flowering months are shown in the calendar under the photos.

Bare root (7 cm, 9 cm, 1 litre, 3 litre): plants sent without a pot or compost, ready to plant straight away. The most economical way to plant a group.

Potted (9 cm, 1 litre, 3 litre): plants growing in our recycled, peat-free compost made in Lincolnshire. Larger sizes give a faster display.

Pack of 3 (7 cm bare-root, 9 cm bare-root, 1 litre bare-root, 3 litre bare-root): three plants of the chosen size at a lower price per plant.

2x Pot & Compost: two plants supplied with pots and compost.

Sizes shown with a line through them are currently unavailable.

At Lincs Plants, we strive to provide fast and reliable shipping to ensure your plants arrive in perfect condition. We offer 1-3 day shipping through a variety of dispatch methods to suit your needs.

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