Grass-leaved Arrowhead

Sagittaria graminea is a dwarf, submerged or marginal, aquatic perennial known from shallow streams, ponds, swamps, and lakes. This species is noted for rarely having leaves that are in the classic sagittate (arrowhead) shape; indeed, the emergent leaves are narrow, lanceolate to elliptic, between 10 and 25cm long, and 2-8cm wide. Plants growing in deeper water (>50cm) form only submersed leaves, which are strap-shaped, 50cm long and 2.5cm wide. From May to August, plants grown in shallower water (and therefore growing partially emersed) produce whorls of 3-petalled white flowers, which are followed by nutlets that contain seeds, each 1.5-3mm long. As S. graminea is a dwarf species, it is ideal for smaller ponds and bog gardens. This low maintenance plant may be grown fully submerged as an oxygenator, partially submerged (in order for it to flower), or planted in the wet, muddy shallows as a marginal. It ideally prefers a sunny position in still or slow-moving water, and typical spread is 30-45cm after a couple of years. Cut back in late summer, removing the dead flowerheads if you wish to prevent self-seeding. Propagation is by seed or by division of the runners.

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