Propagating Hydrocotyle tripartita 'Mini' (Japan Pennywort)

How to propagate Hydrocotyle tripartita 'Mini' by dividing its creeping runner mat and replanting portions in a grid for a fast, dense clover-leaf carpet.

Overview

Hydrocotyle tripartita 'Mini' is the compact form of Japan pennywort, with small green lobed leaves that look like terrestrial clover on creeping stems. It has been an aquascaping favourite for years thanks to its attractive foliage and easy upkeep, working both as a low carpet and as a midground shrub.

Propagation Method

This plant spreads very quickly by runners, so the main way to propagate it is to divide the creeping runner mat and replant the portions. Each stem with its root can be separated and planted as a fully independent plant; stem cuttings work the same way. The key rule is to keep the entire stem, leaf and root parts intact on every piece you divide off.

Step-by-Step

Lift or loosen an established clump and find the creeping runners weaving through it.
Separate the mat into portions, making sure each piece carries stem, leaves and roots together.
Replant the portions across the planting area in a loose grid, leaving gaps between them.
Press each piece gently into the substrate so the roots make contact and the stem stays put.
Let the runners bridge the gaps; the grid fills in quickly into a continuous mat.

Conditions for Healthy Growth

Hydrocotyle tripartita is very easy to grow in CO2-injected tanks, where it forms dense clumps. It can be grown without injected CO2, but then the leaves stay smaller and the clumps are thinner and less dense. Higher light combined with CO2 pushes growth lower and denser, which is ideal when you want a tight carpet. It can be planted in substrate or attached to hardscape, where it also grows well.

Trimming & Maintenance

If the plant is cut back or allowed to bunch, it forms dense mats. Cut runners as soon as they appear wherever you do not want the plant to spread. As a clump matures, older leaves can deteriorate, yellow or be attacked by algae; remove those when you prune.

Common Challenges

Runners spread aggressively into neighbouring plants if not trimmed back regularly.
Without CO2 the carpet stays thin with smaller leaves and looser clumps.
Old shaded leaves can yellow or attract algae, so prune the under-layer during maintenance.