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Goldthread

Coptis trifolia · Ranunculaceae

The gardener's calendar

The right move for September

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

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ID card

Foliage
Evergreen, trifoliate, brilliant green color
Flowering
Spring (April-May), small discreet white flowers
Mature size
10 to 20 cm tall, very compact habit
Growth
Slow
Hardiness
Very hardy (down to -30 °C)
Origin
Boreal and subarctic regions of North America and Eurasia
Soil type
Moist, acidic, rich in organic matter

Care

Watering

Keep the soil consistently moist without waterlogging. This plant enjoys a cool, slightly wet environment typical of its natural boggy and woodland habitat. In a pot, water regularly during the growing season and reduce slightly in winter.

Light Exposure

Choose a semi-shaded or partially shaded location. Goldthread fears intense direct sunlight which can dry out its delicate foliage. A spot beneath tree cover or at a forest edge ideally reproduces its natural conditions.

Soil

Use an acidic, well-draining substrate enriched with organic matter (peat, leaf mold). The plant prefers peaty or very humus-rich soils, poor in lime. A layer of dead leaves or moss on the surface helps it retain moisture.

Fertilizer

Apply little to no fertilizer: this small plant from poor environments scarcely needs it. A modest application of well-decomposed compost in spring is quite sufficient to support its slow growth.

Pruning and Cleanup

No true pruning is necessary. Simply remove dead or damaged leaves as needed. Its naturally compact habit requires no intervention.

Diseases and Pests

Very hardy and rarely affected by common pests. Watch mainly for root rot if water stagnates for prolonged periods. Ensure adequate drainage and good air circulation to prevent any fungal problems.

Did you know?

Goldthread was traditionally used by Indigenous peoples of North America and arctic communities for its tonic properties. This tiny boreal plant, barely visible on a hike, contains alkaloids including berberine, reputed to be useful in traditional medicine, making it a highly prized botanical curiosity for collectors of rare plants.

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.