Nostoc commune thrives in moist conditions. Water regularly to keep the substrate consistently damp, but avoid waterlogging. Allow the surface to dry slightly between waterings.

Good drainage is crucial to prevent root rot, especially in potted environments. Observe the plant for signs of wilting, indicating a need for moisture.

Pruning is typically not necessary for Nostoc commune as it grows in a diffuse, colony-forming manner. If overgrown or spreading beyond desired limits, carefully remove excess material with sterile scissors or a knife.

This can help maintain its shape or contain its spread in specific garden designs or terrariums.

Propagation of Nostoc commune is usually achieved through fragmentation or by allowing its natural colony formation to expand.

Individual fragments of the colony can be gently separated and placed in suitable moist environments where they will establish and grow. Spore propagation is also possible but less common in cultivation.

Repotting Nostoc commune is rarely needed. As an organism that often forms a mat or colony, it doesn't have a traditional root system that becomes pot-bound.

If it outgrows its container or you wish to divide it, gently lift the colony and place it in a new, slightly larger container with fresh, moist substrate.