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Small water-pepper

Persicaria minor · Polygonaceae

The gardener's calendar

The right move for September

Ideal time to plant small water-pepper: 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
July to October
Adult size
20 to 40 cm in height
Growth
Fast
Hardiness
Fairly hardy (-10 to -15 °C)
Origin
Tropical and subtropical Asia
Soil type
Moist to cool, rich in organic matter

Care

Watering

Keep the soil constantly moist, without waterlogging. Water regularly during the growing period (spring-summer), especially in dry spells. Reduce watering in winter. This plant appreciates humid environments and tolerates prolonged drought poorly.

Light exposure

Place your small knotweed in partial shade to dappled light. It also adapts to morning sun exposure, but dislikes harsh afternoon rays in hot climates. Slight shade promotes more vigorous growth.

Soil preparation

Prepare rich, well-draining yet constantly moist soil, enriched with compost or peat. Avoid overly chalky soils and prefer slightly acidic to neutral pH. The soil should remain cool but not waterlogged.

Pruning and cutting

Pruning is not strictly necessary. You can pinch back stem tips in spring to encourage a more compact, branching form. Remove dead or damaged parts at the beginning of the growing season.

Fertilizer

Apply balanced fertilizer (NPK 10-10-10) once or twice monthly during the growing period (March to September). A spring application of well-decomposed compost is usually sufficient for previously enriched soils.

Diseases and pests

Watch for powdery mildew in overly dry air: maintain adequate humidity. Root rot can occur with standing water. Ensure good air circulation and check drainage. Relatively resistant to common pests.

Did you know?

Persicaria minor is a botanical little gem from Asia: though discreet and rarely cultivated in Europe, it is used in traditional Eastern medicine, particularly for its soothing properties. Its genus name "Persicaria" refers to the resemblance of its leaves to those of the peach tree (persica in Latin).

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.