Sweet Grass
Hierochloe odorata
Not currently listed at our partner nurseries.
Essentials
At a Glance
Plant Type
Grass
Height
24 inches
Width
36 inches
Light
Full Sun, Partial Sun
Zones
4, 5, 6, 7, 8, 9
Water
High
Humidity
Moderate to high
Lifespan
Long-lived perennial
Native To
North America, Eurasia
Toxicity
Non-toxic
The Story
Plant Bio
Hierochloe odorata is a cool-season perennial grass known for its sweet, vanilla-like fragrance when crushed or dried. It spreads via rhizomes to form a soft-textured groundcover or meadow. This grass is culturally significant to many Indigenous peoples of North America and is often braided and burned as a smudge for purification, earning it the name 'holy grass'.
Bloom Period:
Uses & Benefits:
Marketplace
Where to Buy
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Planting
How to Grow
- Select a site with full sun and consistently moist soil
- Amend the soil with compost to retain moisture
- Plant plugs or divisions about 12 inches apart
- Water thoroughly after planting to settle the soil
- Keep the area well-watered until the plants are established
- Allow it to spread naturally or install barriers to contain it
Pro Tip
To contain its aggressive spread, plant it in a bottomless container sunk into the ground or provide root barriers.
Keep It Thriving
Care Guide
Do
- Provide consistent moisture; this plant does not like to dry out.
- Grow in full sun for the best growth and fragrance.
- Mow or trim in early spring to encourage fresh, new growth.
- Harvest leaves in early summer for the strongest scent.
Don't
- Don't plant in dry, sandy soil without supplemental irrigation.
- Avoid planting in a mixed perennial bed unless you can contain its spread.
- Don't use herbicides nearby as it is sensitive.
- Don't expect a tidy, clump-forming grass; it is a runner.
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Divide | ||||||||||||
| Harvest | ||||||||||||
| Plant | ||||||||||||
| Spring Cleanup |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Companion Plants
Multiply
Propagation Methods
Good to Know
Common Questions
Sweet Grass questions
What zones can Sweet Grass grow in?
Sweet Grass is hardy in USDA Zones 4–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Sweet Grass deer resistant?
Yes — Sweet Grass is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does Sweet Grass bloom?
Sweet Grass typically blooms in mid-spring through late spring. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Sweet Grass need full sun?
Sweet Grass does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
Keep exploring
Explore the genus
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Grow Sweet Grass with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.
