Sagittaria graminea thrives in consistently moist to saturated soil. Water regularly, ensuring the soil surface remains wet or the plant is submerged in shallow water.

Avoid letting the soil dry out completely, especially during active growth. Maintain a water level of 2-5 cm over the soil surface.

Prune away any yellowed, dead, or damaged leaves as needed to maintain the plant's health and appearance. Trim back any overgrown foliage to keep the plant tidy.

This is typically done in spring or after flowering to encourage new growth and prevent disease.

Sagittaria graminea can be propagated by division of its rhizomes or by seeds. Division is best done in spring. Seeds can be collected after flowering and sown in shallow water or moist soil.

It readily self-propagates in suitable conditions.

Repotting is generally not necessary for Sagittaria graminea when grown in a pond or water garden, as it prefers to spread. If container-grown, repot every 1-2 years in spring into a larger aquatic plant pot, using a heavy, loam-based soil mix and ensuring good drainage.