Propagating Echinodorus opacus (Opacus Sword)

A practical guide to multiplying the compact Echinodorus opacus sword by adventitious plantlets on the inflorescence and by dividing its crown and rhizome.

Overview

Echinodorus opacus is a compact South American sword that grows as a rosette. Like other Echinodorus (Amazon swords), it can grow emersed, with floating leaves, or seasonally submersed, and its leaves range from linear through lanceolate to ovate. It is a heavy root feeder that wants a deep, nutrient-rich substrate.

Propagation Method

There are two reliable routes. First, adventitious plantlets: submersed inflorescences (flowering stems) produce baby plants instead of flowers, and these daughter plants can be separated once rooted. Second, division: an established rosette can be split through the crown and rhizome into separate plants. Grown emersed in humid conditions the plant flowers and sets seed, but in the aquarium the plantlet and division routes are the practical ones.

Step-by-Step

Wait for a flowering stem to arch out; submersed, it forms plantlets at its nodes rather than flowers.
Let each plantlet develop several leaves and its own roots before separating it.
Pinch or cut the plantlet from the stem and plant it in nutrient-rich substrate, keeping the crown above the substrate line.
To divide instead, lift a mature rosette and separate the crown/rhizome into sections, each with leaves and roots.
Replant each section and press 2–3 root tabs into the substrate beside it.

Conditions for Healthy Growth

Temperature: 22–28 °C.
pH: about 6–7.5.
Light: medium; good light supports underwater leaf growth.
Substrate: deep and nutrient-rich; this is a heavy root feeder.
CO2 is not required, but added CO2 often helps stronger growth.

Maintenance

Feed the roots: start with 2–3 root tabs at planting and add tabs monthly, increasing the amount as the plant grows. Remove old or fading leaves at the base, especially the emersed leaves that die back after the plant transitions to submersed growth.

Common Challenges

Leaf melt after planting: emersed leaves fade as new submersed leaves form — this transition is normal.
Stunting or pale leaves: usually a starved substrate; add root tabs.
Slow plantlet production: opacus is slow-growing and rarely flowers, so division is often the faster route.