Water Aglaonema costatum thoroughly when the top 2-3 cm of soil feels dry to the touch. Avoid waterlogging, as this can lead to root rot. Reduce watering frequency during cooler months to prevent overhydration.

Ensure good drainage in the pot.

Prune Aglaonema costatum to maintain its shape, remove yellowing or dead leaves, and encourage bushier growth. Use clean, sharp scissors or pruning shears. Cut back stems just above a leaf node.

Pruning can be done at any time of year as needed.

Aglaonema costatum is easily propagated by stem cuttings or division. Take 10-15 cm cuttings from healthy stems and root them in water or moist potting mix.

Alternatively, divide established plants during repotting, ensuring each section has roots and at least one leaf.

Repot Aglaonema costatum every 2-3 years or when it becomes root-bound. Choose a pot that is only slightly larger than the current one. Use a well-draining potting mix.

Repotting is best done in spring or early summer when the plant is actively growing.