Loosestrife. A spreading perennial with mid-green leaves and attractive arching spikes of white flowers. Height 90cm. Spread 60cm. Flowers July to August. Full sun/partial shade. Hardy.
Lysimachia clethroides, commonly known as gooseneck loosestrife, is a vigorous perennial with arching spikes of white flowers and lush mid-green foliage. Ideal for borders or naturalistic gardens, it produces elegant blooms in midsummer and spreads to create a bold, architectural display.
PLANTING and AFTERCARE GUIDE
Best Planting Time
Spring: The best time to plant Lysimachia clethroides is in spring when the soil is workable. This allows roots to establish before flowering begins, ensuring strong, healthy growth.
Autumn: Alternatively, planting Lysimachia clethroides in early autumn allows the plant to settle in before dormancy, leading to vigorous growth the following season.
Site Selection
Sunlight: Lysimachia thrives in full sun to partial shade. For maximum flowering, select a position with at least a few hours of direct sunlight daily.
Soil: This perennial prefers fertile, well-draining soil that retains some moisture. Enrich the soil with compost or organic matter to support the plant’s vigorous spreading habit.
Planting Instructions
Prepare the Hole: Dig a hole twice the width and the same depth as the root ball of Lysimachia clethroides.
Soil Preparation: Incorporate organic matter such as compost or well-rotted manure to improve soil fertility and drainage.
Planting: Position the plant with the crown level with the soil surface. Backfill carefully, pressing gently to remove air pockets.
Watering After Planting: Water Lysimachia clethroides thoroughly after planting to help roots establish. Continue to keep soil moist but not waterlogged.
Watering Requirements
During the growing season, Lysimachia clethroides benefits from regular watering, especially in dry spells. Keep the soil consistently moist to support lush foliage and flowers.
In dormancy, reduce watering, only adding moisture if the soil becomes extremely dry.
Feeding
Spring: Apply a balanced fertiliser around Lysimachia clethroides to encourage strong growth and flower production.
Midsummer: A light feed during midsummer can help sustain flowering and maintain the plant’s vigour.
Pruning
Deadheading: Remove faded flower spikes from Lysimachia clethroides to maintain a tidy appearance and prevent excessive self-seeding.
Autumn Pruning: Cut stems back to ground level after flowering dies back to prepare the plant for dormancy.
Mulching
Apply a layer of organic mulch around the base of your Lysimachia in spring to retain moisture, suppress weeds, and enrich the soil.
In winter, a mulch layer helps protect roots from cold and prevents frost heaving.
Supporting the Plant
Lysimachia clethroides generally supports itself, but in exposed or windy areas, staking may be necessary to prevent stems from flopping.
Final Tips
Lysimachia clethroides is a hardy, low-maintenance perennial that adds structure, movement, and summer colour to any garden. By planting in fertile, well-draining soil with adequate moisture, and by following this care routine, Lysimachia clethroides will reward you with long-lasting white flower spikes and vigorous foliage year after year.
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