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Big bluestem

Andropogon gerardi · Poaceae

The gardener's calendar

The right move for September

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

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ID card

Foliage
Deciduous, blue-green turning copper-red in autumn
Flowering
Summer to autumn (July to October)
Adult size
120 to 180 cm in height
Growth
Vigorous and rapid
Hardiness
Very hardy down to -25°C
Origin
North American prairies
Soil type
Suited to poor, dry to moderately moist soils

Care

Exposure

Gérard's beardgrass thrives in full sun, which promotes vigorous growth and magnificent autumn colorations. It also tolerates light partial shade, but produces fewer flowers in such conditions. Plant it in a well-open location to optimize its development.

Watering

Once established, this perennial grass is very drought-tolerant and requires little watering. Water regularly during the first year after planting to encourage root development. After that, limit watering except during prolonged dry periods.

Soil and terrain

Gérard's beardgrass adapts to almost all soil types, including the poorest or compacted soils. It does prefer proper drainage, however, as stagnant moisture can promote rotting. No organic matter additions are necessary beyond the initial planting.

Pruning and maintenance

Cut this grass back to ground level in late winter (February-March), before new growth begins. This radical cutting allows you to take full advantage of its spring growth and spectacular autumn tints. Remove dead or damaged stems during the season if needed.

Fertilizer

Gérard's beardgrass requires practically no fertilizer. Excessive nitrogen fertility can weaken the plant's structure and encourage lodging. A moderate spring application is sufficient, or opt for an annual addition of well-decomposed compost.

Diseases and pests

This grass is very resistant to common diseases and pests. It may occasionally suffer from rot in cases of chronic moisture or root asphyxiation. In temperate climates, no treatment is generally necessary with good establishment and adequate drainage.

Did you know?

Gérard's beardgrass is one of the key species of the North American Great Plains, where it played a major role in soil stabilization and bison life. Its highly developed root system (reaching up to 3 meters deep) makes it a prized ecological restoration grass today, particularly for re-seeding degraded soils or creating sustainable ornamental grasslands.

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.