How to prune grassy arrowhead

Remove spent flowers and yellowing foliage throughout summer; cut back dead growth in late autumn or early spring. Snap or cut flower stalks and dead leaves at the base, close to the rhizome. Use waterproof gloves when working at the water's edge. Avoid disturbing the root system unnecessarily.

Light tidying as needed through the season; one full cut-back in autumn or early spring. Grassy Arrowhead is an aquatic marginal that needs minimal pruning. Remove spent flower stems and yellowing leaves through the growing season to keep the plant tidy. Cut back dead foliage in late autumn or early spring before new growth emerges. No hard pruning is required.

Snap or cut flower stalks and dead leaves at the base, close to the rhizome. Use waterproof gloves when working at the water's edge. Avoid disturbing the root system unnecessarily.