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Fringed loosestrife

Lysimachia ciliata · Primulaceae

The gardener's calendar

The right move for September

Ideal time to plant fringed loosestrife: 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
June to August
Adult size
24 to 36 inches tall
Growth
Fast
Hardiness
Very hardy (-20°C and below)
Origin
North America
Soil type
Moist, well-drained, rich in organic matter

Care

Watering

Keep the soil consistently moist, especially during growth and flowering periods. In dry spells, water regularly without allowing water to stagnate. This plant appreciates cool, fresh soil and can even tolerate periodically wet areas.

Light exposure

Place it in partial shade to light shade for optimal growth. It tolerates direct sun in cool, humid climates, but prefers protection from intense afternoon summer heat.

Pruning and cutting

Cut back stems after flowering or in late autumn to encourage a compact, dense shape. You can pinch young shoots in spring to encourage branching.

Fertilizer

Apply compost or organic fertilizer in spring when growth resumes. In fertile soil, a light monthly application during the flowering period is sufficient.

Soil and planting

Plant in soil rich in humus, moist and well-structured. Improve the soil at planting time with compost. This species thrives particularly near water features or along the edges of moist borders.

Diseases and pests

Relatively robust, it can suffer from powdery mildew due to excessive stagnant moisture. Ensure good air circulation. In soil that is too dry, spider mites may occasionally appear.

Did you know?

Ciliate loosestrife fascinates botanists with its tiny hairs on the petioles (leaf stems), from which its name 'ciliata' derives. Historically, plants of the Lysimachia genus were believed to be calming in traditional Native American herbal medicine, though no reliable modern use is documented.

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.