Propagating Bacopa rotundifolia from Cuttings

A practical guide to propagating disk water-hyssop (Bacopa rotundifolia) by stem cuttings — how to top a healthy stem, replant the cutting, and trigger bushy side-shoot growth.

Overview

Bacopa rotundifolia, the disk water-hyssop, is a round-leaved stem plant native to the water bodies of the central United States. Its rounded leaves are 1–3 cm wide with six longitudinal veins, and it can grow both submersed and as a floating or emergent plant. As an undemanding stem plant in the family Plantaginaceae, it is propagated vegetatively from cuttings rather than relying on its slow seed dispersal.

Propagation Method (Cuttings)

Like most aquarium stem plants, Bacopa rotundifolia is multiplied by topping cuttings. You cut the upper portion of a healthy stem and replant it; the remaining base then pushes out new side shoots, so a single stem becomes several over time. This is the only practical method for the planted tank and produces a denser, bushier stand.

Step-by-Step

Choose a healthy stem with firm, green round leaves and visible new growth at the tip.
Cut the top 5–10 cm of the stem just below a leaf node with clean, sharp scissors.
Strip the leaves from the lowest 2–3 cm of the cutting so the bare node can root.
Plant the bare base 2–3 cm deep into the substrate, spacing cuttings so leaves do not overlap.
Leave the original base in place — it will branch into new side shoots within a couple of weeks.

Conditions for Healthy Growth

This species is adaptable and beginner-friendly: it grows well in medium light, tolerates a wide pH and hardness range, and does not require added CO2. Temperatures of roughly 20–28 °C suit it. Because it grows emersed as readily as submersed, cuttings root reliably even in modest setups, though brighter light keeps the round leaves compact and full.

Trimming & Maintenance

Trim roughly every two weeks. Each top cut both shapes the stand and yields a fresh cutting, so routine trimming and propagation are the same task. Remove any yellowing lower leaves and thin out crowded stems so light reaches the base of the clump.

Common Challenges

Stems stretching and shedding lower leaves usually mean light is too weak — increase intensity or top more often.
Floating, unrooted cuttings need their bare base pushed deeper or weighted until roots anchor.
Leaving stems untopped lets them reach the surface and grow emergent, thinning the submersed display.