Maintain consistent saturation for Largeleaf Pondweed, ensuring it is fully submerged. The substrate should remain wet at all times. For aquariums, aim for clear, still, or slow-moving water.

Avoid letting the water level drop significantly, which can stress the plant.

Pruning is generally not required for Potamogeton amplifolius. If the plant becomes excessively dense, overgrown leaves or stems can be selectively removed to improve water circulation and aesthetics.

Cut stems just above the substrate or a healthy leaf node using sharp aquatic scissors.

Propagation is typically done through division of the rhizomes. During repotting or when plants are dense, carefully separate sections of the root system, ensuring each piece has at least one healthy bud or shoot.

These can then be replanted in suitable substrate.

Repotting is usually only necessary if the plant outgrows its container or the substrate becomes depleted. This is best done in spring or early summer.

Use a large, aquatic planting pot filled with nutrient-rich aquatic soil or a mix of loam and sand. Ensure good drainage within the pot.