Propagating Helanthium bolivianum

How to propagate the chain sword Helanthium bolivianum from runners that chain daughter rosettes into a carpet, with the root-fed, well-lit conditions it needs.

Overview

Helanthium bolivianum, the chain sword, is a versatile foreground rosette in the family Alismataceae, native to southern Mexico, Central America, the West Indies and South America. It sends out numerous runners that form a carpet of small rosettes, ideal for a natural meadow-like foreground. The cultivar 'Quadricostatus' has been synonymised with Helanthium bolivianum.

As a rosette it is never topped; it spreads on its own through stolons (runners) that chain daughter plants outward.

Propagation Method

The plant is fast growing and sends out runners everywhere. Each runner roots down and produces a new daughter rosette, gradually chaining the plants into a carpet. Runners grow quickly with proper nutrition, light and CO2; under decent conditions give plants a few weeks to establish and they will send out runners like mad.

Step-by-Step

1. Plant the parent rosette in nutrient-rich substrate and let it establish for a few weeks.
2. Allow the runners to spread and root their daughter rosettes.
3. Once a daughter plant has its own roots and several leaves, snip the connecting stolon.
4. Replant the separated rosette where you want to extend the carpet.
5. Tuck a root tab beneath new plantings to fuel the next wave of runners.

Conditions for Healthy Growth

Provide a nutrient-rich substrate or plenty of root tabs, medium light, and good nutrition. Runner spread accelerates with adequate light, nutrients and CO2.

• Temperature: 22-28 C
• pH 6-7.5, GH 3-12
• Medium light; nutrient-rich substrate with root tabs; CO2 speeds carpeting

Maintenance

Thin out the carpet periodically by removing or relocating excess daughter rosettes so the bed stays low and dense. Trim damaged leaves at the base and keep the substrate fertile.

Common Challenges