Ammannia crassicaulis thrives in consistently moist to submerged conditions. In aquariums, ensure the substrate is always wet or the plant is fully submerged.

For terrestrial cultivation, maintain a waterlogged pot or a very damp soil, similar to bog plants, ensuring no drying out occurs.

Pruning is primarily for aesthetic shaping and encouraging bushier growth. Trim leggy stems by cutting just above a leaf node. This stimulates new side shoots, resulting in a more compact and fuller plant.

Regular trimming prevents overcrowding and maintains desired form.

Propagation is easily achieved through stem cuttings. Simply cut healthy stems just below a node and plant them directly into the substrate or float them in water.

Roots will develop quickly, allowing for new plants to be established within a short period.

Repotting is generally only necessary for terrestrial or emergent setups when the plant outgrows its container or the substrate becomes depleted. Use a nutrient-rich, water-retentive potting mix.

For submerged growth, repotting is less common as it's typically planted directly into the aquarium substrate.