Ogon Grassy-Leaved Sweet Flag (Acorus gramineus 'Ogon')
ah-KOR-us gram-IN-ee-us 'Ogon'

Deciduous Perennial in the Acoraceae Family
A dwarf, grass-like accent with slender golden-yellow leaves striped green, forming a low, slowly spreading mat at the water's edge or in moist, partly shaded beds.

Acorus gramineus 'Ogon' is a dwarf, grass-like selection of Japanese sweet flag grown for its narrow, arching leaves striped bright golden-yellow and green. It forms a low, slowly spreading clump rather than a true grass, and its foliage keeps its color through the growing season, brightening pond edges, bog gardens, and shaded beds.

Non-invasive and easy-care once sited in consistently moist to wet soil, it spreads gradually by rhizome to form a tidy groundcover. In mild winter climates it stays semi-evergreen to evergreen; in the Chicago area it more typically dies back over winter like a deciduous perennial.

Pros

  • Bright golden-yellow, grass-like foliage brings color to shady, wet spots
  • Low, dwarf habit works well as an edging or small-scale groundcover
  • Low-maintenance once sited, with no serious pest or disease problems
  • Non-invasive, slow to moderate spread by rhizome

Cons

  • Needs consistently moist to wet soil; leaf tips scorch if it dries out
  • May not reliably overwinter in the coldest parts of Zone 5
  • Foliage color is best with some sun; too much shade can mute the gold
Highlights A dwarf golden-foliage accent for pond edges and shady, moist beds, valued for color rather than flowers.
 

Plant Data

Mature Size 6 - 12 inches tall. 6 - 12 inches wide.
Growth Rate Slow
Sun Exposure Partial Shade - Full Sun
Moisture Tolerance Medium - Wet: Tolerates shallow standing water and consistently moist to wet soil; leaf tips scorch if allowed to dry out.
Zones 5a - 9b (Usually hardy to -20° F)
Tags Container, Deciduous, Deer Resistant, Full Sun, Grasses, Grown For Attractive Foliage, Medium, Native to Asia, Partial Shade, Partial Sun, Perennial, Potentially Toxic, Rabbit Resistant, Wet, Wet Site Tolerant, Yellow Foliage
Bloom Period June to July
Flower Color Greenish Yellow
Foliage Color
 

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Commonly Planted with...

Pairs well with other moist-shade and pond-edge plants such as hostas, ferns, astilbe, and Japanese forest grass (Hakonechloa), whose greens set off its golden foliage.

Photos of This with...

Ogon Grassy-Leaved Sweet Flag, Rising Sun Japanese Maple, Superbells Pomegranate Punch Calibrachoa, Superbells Tropical Sunrise Calibrachoa, Pink Cyclamen, Prince Tut Papyrus, Cushion Spurge, Diamond Snow Spurge, Tuscan Sun Ox-Eye Daisy, Champion Hellebore, Blackie Sweet Potato Vine, Laguna Compact Blue with Eye Lobelia, Golden Globes Loosestrife, Waikiki Sunset Loosestrife, Charmed Wine Shamrock, Senetti Blue Bicolor Florist's Cineraria, Supertunia Mini Vista Yellow Petunia, Supertunia Trailing Strawberry Pink Veined Petunia, Variegated Swedish Ivy, Variegated Solomon's Seal, ColorBlaze El Brighto Coleus, ColorBlaze Mini Me Watermelon Coleus, Merlin's Magic Coleus, Persian Shield, Snowstorm Blue Bacopa, Catalina Pink Wishbone Flower,
 
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Pricing and Availability History

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Past Availability
2025 : 02/05 - 10/04
2024 : 02/08 - 10/05
2023 : 03/02 - 09/30

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Field-Grown vs. Greenhouse-Grown Plants

Plants which are well-adapted to our local climate are most often field-grown (outside). Field-grown plants are generally cheaper and have the advantage of already somewhat acclimated to our cold winters, but that means they’re not artificially far along in the spring and tend to bloom at the normal time in our area.

Spring annuals and tender perennials are typically grown in Greenhouses so they can be ready and luxurious exactly when customers want them. Some perennials are also “forced” into early bloom in greenhouses. In May, there can be a very big difference between field-grown and greenhouse-grown plants of the same type. The latter typically look good right away (so they’re a great choice where that’s important), but we typically pay a premium for it.


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To secure the best prices for club members and make sure we know the current plants available from each nursery, we take orders only a couple of times a month.

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No Pricing or Availability Right Now

We order from a rotating cast of the best nurseries in the Great Lakes region. It looks like we've offered this plant in the past, but the nurseries we're working with this week don't appear to have it in stock at the moment.

Our goal is to bring as many plants together under "one roof" as possible, so we'll try hard to make it available again in the future!