Slender yellow loosestrife Plant Care

Slender yellow loosestrife (Lysimachia tenella) belongs to the Primulaceae family within the Lysimachia genus. Slender yellow loosestrife is native to a variety of damp habitats from calcareous dune slacks to boggy and peaty heaths in western and southern Europe and Northwest Africa. Slender yellow loosestrife is also known as Coastal loosestrife.

Slender yellow loosestrife displays a spreading ground cover growth habit, reaching up to 1 ft tall with a spread of approximately 2 ft. Slender yellow loosestrife produces small, yellow, star-shaped flowers in clusters.

Leaf size: approximately 2 inches.

Lysimachia tenella requires watering every 3–7 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.

Slender yellow loosestrife thrives in partial to full shade. Avoid placing Slender yellow loosestrife in direct, harsh sunlight for extended periods, as this can scorch the foliage.

Lysimachia tenella grows best at temperatures of 60–80°F. Slender yellow loosestrife prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Moist, well-draining soil rich in organic matter. Good drainage is essential for Slender yellow loosestrife to prevent waterlogging, which leads to root rot and fungal issues.

Feed Slender yellow loosestrife every month during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.

Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.

The PlantoScan app can remind you when to water and when to fertilize each plant.

Divide and repot every 2-3 years in spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.

Slender yellow loosestrife can be propagated through division, stem cuttings, seeds. Similar propagation techniques also apply to fringed loosestrife plant care, which shares the same genus.

See all plants toxic to cats and plants toxic to dogs.

Slender yellow loosestrife is susceptible to aphids, slugs, snails. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.

Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.

Slender yellow loosestrife grows outdoors in USDA Zone 7a – 9b. It survives winters down to planting zone 7a. Slender yellow loosestrife is native to a variety of damp habitats from calcareous dune slacks to boggy and peaty heaths in western and southern Europe and Northwest Africa.