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Gromwell

Lithospermum officinale · Boraginaceae

The gardener's calendar

The right move for September

Ideal time to plant gromwell: 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
Flowering
April to June, pale yellow flowers
Adult size
30 to 60 cm in height
Growth
Moderate
Hardiness
Very hardy, down to -15 °C
Origin
Temperate and southern Europe
Soil type
Well-drained, chalky or neutral

Care

Exposure

Gromwell prefers full sun to partial shade to thrive fully. Areas with at least 4 to 6 hours of direct sunlight encourage abundant flowering. Avoid overly shaded spots that slow growth.

Soil

This plant appreciates well-drained soil, dry to moderately moist, and prefers chalky or neutral terrain. It tolerates poor and rocky soils, typical of its natural habitat. Avoid compact and heavy soils that promote waterlogging.

Watering

Water moderately and allow the soil to dry slightly between waterings. Once established, gromwell is fairly drought-resistant. During the active growing season (spring-summer), maintain regular moisture without excess.

Fertilizing

No fertilizer is necessary in naturally rich soil. In pots or depleted soil, a light application of balanced fertilizer in spring is sufficient. Avoid excess nitrogen, which promotes foliage at the expense of flowering.

Pruning and maintenance

Cut back lightly after flowering to encourage a compact shape and possible reflowering. Remove dead or diseased stems in spring. No intensive pruning is necessary on this hardy species.

Diseases and pests

Gromwell is rarely affected by diseases. In case of excess humidity, watch for powdery mildew or rust. Good air circulation and optimal drainage are generally sufficient to prevent any health issues.

Did you know?

Gromwell was once used in traditional pharmacopeia for various popular remedies. Its scientific name, Lithospermum, literally means 'stone seed' because of the shape and hardness of its smooth, mineralized fruits, which resemble small shiny pebbles.

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.