Does it need full sun?

It thrives in full sun but tolerates partial shade.

It is naturalized in many areas but generally not considered aggressive.

Plant guide

Sweet vernal grass.

Anthoxanthum odoratum

Pronounced an-thok-SAN-thum o-dor-AY-tum

Sweet vernal grass is a charming, fragrant perennial known for its sweet scent of coumarin when dried. It is a common sight in meadows and pastures throughout Europe and parts of North America. You will love how its subtle perfume fills the air in early summer.

Another photo of Sweet vernal grass — Photo by Tom Norton (CC BY) via iNaturalist

At a glance

Care level: Easy
Plant type: Perennial grass
Light: Full sun
Indoor light: Direct sun
Water: Every 7 to 14 days
Mature size: 1.5 feet
Growth rate: Medium
Hardiness: USDA 4 to 9
Bloom time: Late spring to early summer

Care

This grass prefers open, sunny spots and thrives in well drained soil. Keep an eye out for overcrowding, which can lead to poor air circulation. It is quite hardy and needs very little attention once established.

Watering: Keep the soil consistently moist but never soggy.
Feeding: A light application of balanced fertilizer in spring is plenty.
Pruning: Trim back dead foliage in late winter to make room for new growth.
Repotting: Repot only if the plant becomes root bound in its container.
Soil: Well drained, loamy soil
Soil pH: Acidic to neutral
Temperature: -20 to 30°C
Humidity: 40 to 80%
Drought tolerance: Moderate
Lifespan: Perennial, typically 3 to 5 years
Fragrance: Strong
Deer and rabbits: Moderate

Signs it needs repotting

roots circling the pot
water draining too quickly
stunted growth

Safety

People: The plant is generally considered non toxic but should not be ingested due to coumarin content.
Children: The grass blades can be sharp and may cause minor paper cuts if handled roughly by children.
Contact allergens: The leaves have fine hairs that may cause mild skin irritation in sensitive individuals.
Airborne allergens: The pollen is a common seasonal allergen for many people.
Edibility: While the plant is aromatic, it is not typically consumed by humans and contains coumarin which can be harmful in large quantities.

How to identify it

Slender, upright green stems
Dense, cylindrical flower spikes
Distinct sweet hay scent
Narrow, flat leaf blades
Yellowish green flower color

Height: 0.2 to 0.5m
Spread: 0.15 to 0.3m
Leaves: green, deciduous
Flowers: yellow, green, 0.5 to 1cm

Problems to watch for

RustCommon
Red ThreadUncommon
SmutUncommon
ErgotRare

By symptom

Plant problems by symptom

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Growing it

Propagation: seed, division
When to plant: spring, autumn
Overwintering: The foliage may die back in winter, so trim the dead growth in early spring to make room for new shoots.
In containers: It grows well in containers if provided with good drainage and enough space for roots.

Seed

1. Collect seeds in late summer.
2. Sow in trays in autumn.
3. Keep moist until germination.

Division

1. Dig up the clump in spring.
2. Separate into smaller sections.
3. Replant immediately.

Plant in drifts with other meadow wildflowers to create a naturalistic look.

Grows well with

Common Daisy · They share similar meadow habitat requirements.
Red Clover · It fixes nitrogen which helps the grass grow in poor soil.

Similar species

Sweet Grass · Both species share a distinct sweet scent.

Science

Family: Poaceae
Genus: Anthoxanthum
Order: Poales
Class: Liliopsida
Native range: Europe, Western Asia, and North Africa.
Conservation: This species is common and widespread, not currently of conservation concern.

It is a hardy grass that thrives in acidic, nutrient poor soils and open meadows.

Value to wildlife: larval host plant, seeds provide food for birds
Pollinators: bees, butterflies
Uses: ornamental grass, scented gardens, meadow restoration

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 1/9
Soil reaction: 4/9
Light: 6/9
Temperature: 5/9
Moisture: 5/9
Nutrients: 3/9

Taxonomy resolved against GBIF.

Questions people ask

Does it need full sun?: It thrives in full sun but tolerates partial shade.
Is it invasive?: It is naturalized in many areas but generally not considered aggressive.

Where the name comes from

The name Anthoxanthum comes from the Greek words for flower and yellow, referring to the color of the inflorescence. Odoratum refers to the sweet scent of the plant.

Good to know

It is often called sweet vernal grass.
The scent intensifies as the plant dries.
It was historically used to scent linens.

Keep your sweet vernal grass growing

This page is a general guide. Save your plant in Pocket Botanist and you get care reminders timed for this plant, plus a care history that shows what worked.

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This guide was generated with AI on September 26, 2026 and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.