Sagittaria aginashi thrives in consistently moist to waterlogged conditions. Maintain a water level of at least 5-10 cm above the soil surface for optimal growth.

Avoid allowing the substrate to dry out completely, as this can stress the plant and lead to reduced vigor. Regular monitoring is essential.

Pruning is generally minimal for Sagittaria aginashi. Remove any yellowing or decaying leaves promptly to maintain plant health and aesthetics.

Trim back overly long or leggy growth if necessary to encourage a more compact form, although this is rarely needed.

Sagittaria aginashi readily propagates through the production of runners or stolons which bear new plantlets.

These can be separated from the parent plant once they have developed a few leaves and roots, and then replanted in suitable substrate. Division of larger clumps is also effective.

Repotting is usually only necessary when the plant becomes pot-bound or if it outgrows its container. This is typically done in spring. Use a well-draining, nutrient-rich aquatic soil mix.

Ensure the new pot is adequately sized to accommodate the root system and any developing runners.