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Anthoxanthum nipponicum

Anthoxanthum nipponicum · Poaceae

The gardener's calendar

The right move for September

Ideal time to plant anthoxanthum nipponicum: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.

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ID card

Common name
Japanese sweet vernal grass
Family
Poaceae (grasses)
Origin
Japan
Foliage
Deciduous
Flowering
Spring to early summer
Adult size
16–24 inches tall
Hardiness
Hardy to –5 °F
Growth
Fast

Care

Sunlight

Plant Anthoxanthum nipponicum in full sun or partial shade for optimal growth. This grass appreciates bright locations that promote foliage density and enhance the fragrance of the flower spikes. Avoid dense shade, which would slow its growth.

Soil

This grass prefers well-draining, light, and fertile soil. It tolerates slightly acidic to neutral soils. Improve poor soil by incorporating compost or potting mix before planting to encourage establishment.

Watering

Water regularly during the first year and during dry periods. Once established, this grass tolerates moderate water shortages well. Keep the soil moist without waterlogging it to prevent root rot.

Pruning and cutting

Cut back the clump in late winter (February–March) before growth resumes, to about 4 inches from the ground. This deciduous grass regenerates naturally in spring. Remove faded flower spikes if you wish to extend its ornamental appeal.

Fertilizer

A balanced fertilizer application in spring is generally sufficient. Avoid excess nitrogen, which could weaken the clump structure. Well-decomposed compost applied to the surface each autumn makes an excellent natural amendment.

Diseases and pests

This grass is generally very resistant. Problems arise mainly with waterlogged soil or stagnant moisture. Ensure good drainage and air circulation to prevent fungal rot.

Did you know?

Anthoxanthum nipponicum's main appeal lies in its sweet, vanilla-like fragrance highly prized in Japan, particularly during spring flowering. This rare olfactory characteristic among grasses makes it a prestigious ornamental grass, historically cultivated near traditional homes to perfume gardens without artificial intervention.

Where to buy it

Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.

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Tips generated and checked by Viridia — adapt them to your local climate.