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Persicaria filiformis

Persicaria filiformis · Polygonaceae

The gardener's calendar

The right move for September

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

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ID card

Common name
Threadleaf Smartweed
Family
Polygonaceae
Type
Annual or perennial herbaceous plant depending on climate
Foliage
Deciduous, fine and linear
Blooming
Summer to autumn, small pink or white flowers
Adult size
30 to 60 cm in height
Hardiness
Moderate, temperate to warm climate
Origin
South and Southeast Asia

Care

Watering

Keep the soil consistently moist, especially during active growing periods. Water deeply once or twice a week depending on weather conditions. Avoid waterlogging, which promotes root rot. Reduce watering in winter or during dormancy.

Light Exposure

Place your plant in full sun or partial shade. It tolerates partially shaded spots but flowers more generously in bright light. Protect it from strong winds that could damage its delicate, thin stems.

Soil

Use well-draining soil rich in organic matter. A light mix enriched with potting soil works well. Avoid compacted or chalky soils. A slightly acidic to neutral pH is optimal.

Fertilizer

Apply balanced, diluted fertilizer every 3 to 4 weeks during the growing season. Moderate feeding is sufficient; over-fertilizing encourages growth at the expense of flowering. Stop feeding in autumn-winter.

Pruning and Cutting

Regularly pinch back young stems to encourage branching and a bushy shape. Remove spent flowers to extend blooming. Cut out dead or damaged stems in early spring.

Pests and Diseases

Watch for powdery mildew if humidity is excessive. Good air circulation prevents most fungal issues. Regularly inspect leaves for spider mites or aphids, especially indoors.

Did you know?

Threadleaf Smartweed belongs to the Polygonaceae family, which includes buckwheat and sorrel; it was once used in traditional Asian medicine for its supposed soothing properties. Its fine, delicate leaves resemble filaments (hence its name 'filiformis'), making it an original ornamental plant for textured gardens.

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.