Mace Sedge (Carex grayi)

Mace Sedge | Carex grayi

Architectural pond plant with striking star shaped seed heads and graceful foliage

Mace Sedge, known botanically as Carex grayi, is a truly distinctive marginal pond plant that brings bold structure and visual interest to pond edges, bog gardens, and damp planting areas. Best known for its unusual star shaped seed heads, this plant creates a unique focal point that stands out in both naturalistic and more designed water gardens.

Appearing from late spring into summer, the seed heads form intricate green star like clusters that gradually mature and add texture throughout the season. These unusual forms make Mace Sedge a favourite among gardeners looking for something a little different, offering interest beyond traditional flowers. Combined with its arching, narrow green foliage, it creates a soft yet architectural presence around the pond edge.

This clump forming perennial grows in neat, manageable tufts, making it suitable for both smaller ponds and larger wildlife areas. It spreads gradually without becoming invasive, allowing it to integrate beautifully with other marginal plants. Its dense foliage provides excellent ground cover, helping to stabilise soil and prevent erosion along pond margins.

Mace Sedge is also highly beneficial for wildlife. The thick foliage offers shelter for amphibians such as frogs and newts, while also providing cover for insects and small pond creatures. This makes it an excellent addition to wildlife friendly ponds where creating a balanced ecosystem is important.

Thriving in moist to wet soils or shallow water up to around 20 cm deep, this plant is ideal for marginal shelves and boggy borders. It performs well in full sun or partial shade, giving flexibility in planting design.

Fully hardy in UK conditions, Mace Sedge is a reliable and low maintenance choice that will return year after year. Whether used as a structural feature or as part of a mixed planting scheme, it brings texture, movement, and ecological value to any pond setting.

🇬🇧 UK-grown aquatic plant: Grown at a dedicated aquatic plant nursery in the South of England and carefully prepared for delivery across the UK.

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Key Benefits

• Unique star shaped seed heads for standout visual interest
• Adds structure and texture to pond margins
• Clump forming and easy to manage
• Provides shelter for amphibians and wildlife
• Suitable for both small and large ponds
• Hardy and reliable in UK conditions

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Reasons to Buy

• A truly unusual and eye catching pond plant
• Perfect for adding architectural interest
• Works well in natural and formal planting schemes
• Low maintenance and easy to grow
• Ideal for wildlife friendly ponds

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Care Instructions

• Plant on a marginal shelf or in damp soil at a depth of 0 cm to 20 cm.
• Position in full sun or partial shade depending on your pond layout.
• Keep soil consistently moist or allow shallow water coverage.
• Cut back old foliage and seed heads in late autumn to tidy the plant.
• Divide clumps every 3 to 4 years in early spring to maintain vigour.
• Monitor young growth for slugs and snails in spring.

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Flowering Period

May to August (seed heads provide extended interest beyond flowering)

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Size and Growing Conditions

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Dispatching Your Pond Plants

Your Mace Sedge will be carefully packed to protect the foliage and roots during transit.

Orders received by 11am Monday to Wednesday are normally dispatched on the following working day using a next working day courier service. During busy periods, dispatch may occasionally take an extra day.

To avoid plants being held in depots over a weekend, we do not usually dispatch on Fridays. Highlands and Islands orders using a two day service are not normally dispatched on Thursdays.

Available basket sizes:

• 1 Litre Basket – usually 11 × 11 × 11cm square; some varieties may be supplied in a 14cm diameter × 10cm round basket
• Pack of 3 × 1 Litre Baskets – each usually 11 × 11 × 11cm square
• 3 Litre Hexagonal Basket – 18 × 18 × 16cm

Planting depth is measured from the top of the aquatic basket to the water surface.

Finofil baskets are manufactured in the UK from 100% recycled plastic and are fully recyclable. Their fine dual-mesh construction helps retain aquatic soil while allowing water and nutrients to reach the roots. Basket shape may vary slightly depending on the plant and supplier availability.

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Similar pond plants

For another pond-edge planting option, compare Cyperus Sedge (Carex pseudocyperus) and Marsh Cinquefoil (Potentilla palustris). Explore the Carex pond plant group to compare the whole collection.

Explore more marginal pond plants or browse our complete pond plants range. Need baskets, aquatic soil or planting essentials? Browse our pond plant baskets and aquatic planting supplies.