Sweet flag

Sweet Flag, also known as Acorus calamus, is a strong and elegant pond plant that brings fresh green colour and natural height to the edge of a pond or water garden. Its upright, sword shaped leaves create a clean vertical form, making it ideal for softening pond borders, planting beside streams or adding structure to shallow water areas.

This easy to grow marginal pond plant is perfect for wet soil, marshy ground and pond edges where the roots can stay consistently moist. Sweet Flag looks especially good in natural ponds, wildlife ponds, koi ponds, swim ponds and planted filter zones. The foliage has a light aromatic scent, which adds extra character to this classic water garden plant.

For best results, plant Sweet Flag in full sun or partial shade, either directly into wet ground or in an aquatic planting basket at the pond margin. Once established, it forms a reliable clump of fresh green leaves and returns each spring after dying back in winter.

Acorus calamus is a hardy marginal aquatic perennial suitable for consistently wet soils and shallow water planting. It usually reaches around 60 to 80 cm in height, with mature growth capable of reaching up to 120 cm in favourable conditions. The recommended planting depth is 0 to 40 cm below the water surface, making it suitable for pond shelves, bog gardens, wet banks and helophyte filtration systems.

This species produces narrow, upright, aromatic foliage and gives strong architectural form to aquatic planting schemes. It performs best in nutrient rich, permanently moist substrates and can be used as a structural marginal plant in naturalistic designs, reed bed style planting and biological filter zones. Flowering is subtle, usually appearing in late spring to early summer, with small greenish flower spikes from May to June.

Sweet Flag is a dependable choice for customers looking for a hardy pond edge plant, marginal water plant, aquatic plant for wet soil or structural green foliage plant for pond landscaping.