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Hedgehyssop

Gratiola officinalis · Plantaginaceae

The gardener's calendar

The right move for September

Ideal time to plant hedgehyssop: 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
Blooming
June to September
Adult size
20 to 40 cm in height
Growth
Fast
Hardiness
Very hardy (down to -15 °C)
Origin
Europe, temperate wetland zones
Soil type
Moist to very moist, rich in organic matter

Care

Watering

Gratiole enjoys constantly moist, even marshy environments. Keep the soil consistently fresh without letting it dry out completely. In pots, regular watering and a permanent saucer of water are recommended. It thrives particularly well near a pond or a damp area of your garden.

Light Exposure

Choose a partially shaded to sunny spot. Gratiole tolerates partial shade well and flourishes with at least 3 to 4 hours of direct light daily. It's ideal for pond edges or semi-shaded areas of a water garden.

Soil and Substrate

Rich, humus-laden, and well-draining soil that remains moist is ideal. Enrich the soil with compost or potting soil before planting. This plant adapts well to peaty substrates and alluvial soils typical of marshy areas.

Pruning and Maintenance

No real pruning is necessary. You can lightly cut back stems after flowering to encourage a more compact shape. In late autumn, after foliage dies back, clean up last year's debris for better spring regrowth.

Fertilizer

An annual application of well-decomposed compost or organic fertilizer in spring is more than sufficient. Avoid nitrogen-rich fertilizers that would encourage excessive foliage growth at the expense of flowering.

Pests and Diseases

Gratiole is generally very robust in appropriate moist conditions. The risk of rot increases with permanent water stagnation or poor aeration. Watch for aphids during warm periods, treatable with gentle solutions if needed.

Did you know?

Gratiole officinalis enjoyed a miraculous reputation in the Middle Ages, earning the nickname 'Herba Dei' (herb of God) for its supposed healing properties. Once considered a panacea, it lost prestige as science advanced. Today, it remains a discreet yet valuable plant in water gardens and ornamental wetland landscaping.

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.