Isoetes alstonii thrives in consistently moist to submerged conditions. Maintain a water level that keeps the substrate saturated, especially during active growth.

Avoid allowing the substrate to dry out completely, as this can stress the plant. Regular monitoring and top-ups are essential for optimal health.

Pruning is generally not required for Isoetes alstonii. Remove any decaying or damaged leaves by gently pulling them away from the base of the plant.

This helps maintain the plant's aesthetic appeal and prevents potential disease.

Propagation is typically achieved through division of established corms or by collecting spores from mature plants. Corms can be separated during repotting.

Spore propagation is more advanced and requires specific conditions for germination.

Repot Isoetes alstonii when it outgrows its container or if the substrate becomes depleted. This is best done during spring or early summer.

Use a nutrient-rich aquatic substrate, ensuring the corm is planted at the correct depth to allow for new leaf growth.