HC Cuba Propagation Guide: Dividing and Replanting Dwarf Baby Tears

HC Cuba (Hemianthus callitrichoides) is one of the smallest ground creepers in the hobby, prized for the exceptionally fine carpet it forms in the foreground. It is multiplied by division rather…

Overview

HC Cuba (Hemianthus callitrichoides) is one of the smallest ground creepers in the hobby, prized for the exceptionally fine carpet it forms in the foreground. It is multiplied by division rather than seed: a healthy portion is split into smaller pieces, each of which produces runners that branch off and creep along the substrate. Its small size and high demands make it one of the more challenging carpet plants to propagate reliably.

Propagation Method (Cuttings)

Once planted, each portion produces runners which are individual stems that branch off and grow along the substrate. To multiply an existing carpet, single stems can be snipped from the top growth and inserted into the substrate roughly 1.5 inches apart. Planting many small portions rather than a few large ones gives the runners room to knit the gaps into a continuous mat.

Step-by-Step

1. Snip single stems from healthy top growth, or divide an established mat into small portions.
2. Using planting tweezers, insert each piece into the substrate about 1.5 inches apart in a grid.
3. If starting from a tissue-culture cup, rinse only in cycled aquarium water, never tap water, which can kill the plant.
4. Let each portion send out runners that branch and creep to close the gaps over time.
5. Alternatively use the dry start method to establish the carpet emersed before fully flooding the tank.

Conditions for Healthy Growth

HC Cuba is notorious as one of the more difficult carpet plants to grow well, with relatively high light and carbon dioxide requirements. Attempting to grow it without injected CO2 carries about a 95% failure rate, so stable CO2 plus strong lighting are effectively prerequisites for a dense, healthy carpet.

Trimming & Maintenance

Regular trimming of the top growth keeps the carpet thin and dense and supplies fresh single stems that can be replanted as new propagation material. Without it, the mat thickens, the lower layer is shaded, and patches can detach from the substrate.

Common Challenges

The biggest pitfall is the high CO2 dependence: without injection the failure rate is roughly 95%. Rinsing tissue-culture stock in tap water can kill it outright, and insufficient light leaves the carpet sparse and prone to algae. Many growers therefore establish it via the dry start method before submerging the tank.