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Masterwort

Imperatoria ostruthium · Apiaceae

The gardener's calendar

The right move for September

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

JFMAMJJASOND Planting

ID card

Family
Apiaceae
Plant type
Perennial herbaceous
Foliage
Deciduous
Flowering
June to August
Adult size
60 to 90 cm in height
Hardiness
Very hardy (down to -15°C)
Origin
Central and mountainous Europe
Growth
Moderate to fast

Care

Light exposure

Masterwort prefers a partially shaded or sunny location, particularly in warm regions where it appreciates afternoon shade. It tolerates bright areas well but not scorching sun. Indirect exposure promotes generous flowering without risk of drying out.

Soil

This plant appreciates rich, well-drained soil that is slightly moist. It adapts to ordinary soil enriched with organic matter and prefers non-calcareous environments. A compost application in spring stimulates vigor.

Watering

Water regularly during the growing season to keep the soil fresh without waterlogging. During summer, intensify watering in case of prolonged drought. In winter, drastically reduce watering as the plant goes dormant and tolerates dryness well.

Fertilizer

An application of balanced fertilizer in spring, at the start of vegetation, is generally sufficient. You can supplement with well-decomposed compost. Avoid excess nitrogen which would favor foliage at the expense of flowering.

Pruning and cutting

Remove spent flowers regularly to prolong flowering and prevent self-seeding. In late autumn, cut back dry stems to ground level. Cleaning dead foliage improves appearance and prevents disease.

Diseases and pests

Masterwort is generally robust and rarely susceptible to disease. However, be wary of powdery mildew in overly humid and stagnant conditions. Good spacing promotes air circulation and reduces the risk of fungal infections.

Did you know?

Masterwort owes its scientific name 'Imperatoria' to its historical reputation: in the Middle Ages, it was considered one of the royal herbs and featured in monastery gardens for its presumed medicinal properties. Its aromatic rhizome was long sought after in traditional European herbalism.

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.