Plant Propagation Guide: Multiply Your Aquarium Plants for Free

Best for: Vallisneria, Sagittaria, Dwarf sag, Cryptocoryne parva, and many carpeting plants (Monte Carlo, Dwarf baby tears).
How to do it: A runner is a horizontal shoot that grows away from the mother plant, producing small plantlets at nodes. Allow the runner to grow until the new plant has at least 4‑5 leaves and visible roots. Cut the runner between the mother and new plant, then gently remove the new plant.
Pro tip: Don’t cut runners too early – immature plantlets have low survival rates. Wait until the new plant is at least 1‑2 inches tall.

Best for: Java fern, Anubias, Bucephalandra, Bolbitis.
How to do it: These plants grow from a thick horizontal stem (rhizome). Remove the plant from the tank. Use sharp scissors or a knife to cut the rhizome into sections, each containing at least 2‑3 leaves and some roots. Tie or glue each section to a new piece of wood or rock – never bury the rhizome in substrate (it will rot).
Pro tip: Anubias grows extremely slowly. Be patient – it may take 3‑6 months for a single rhizome division to become a full plant.

Best for: Java fern (Microsorum pteropus), certain mosses.
How to do it: Java fern mother plants will grow small plantlets directly on mature leaves. When these plantlets have 3‑4 leaves and small roots, gently pluck them off and attach them to new wood or rock.
Pro tip: Leave the plantlet until it naturally begins to separate – forcing it too early reduces survival.

• Hornwort (Ceratophyllum demersum): Literally just cut a stem into 4‑6 inch segments. Each segment becomes a new plant.
• Water sprite (Ceratopteris thalictroides): Produces plantlets on leaf tips. A single plant can become 20 in 2 months.
• Pogostemon stellatus (Octopus plant): Stem cuttings root in 3‑5 days.
• Duckweed: Every frond is a new plant. Remove regularly unless you want to cover the entire surface.

• Fine‑tipped aquarium scissors (curved or straight)
• Long tweezers or forceps
• Small container for holding cuttings during the process
• Superglue gel (cyanoacrylate) for attaching epiphytes
• Fishing line or cotton thread (alternative to glue)
• Disposable gloves (optional – some plants can be irritating)

For serious propagation, set up a dedicated grow‑out tank:

• Shallow tank (10‑20 gallons) for easy access
• Substrate: aquasoil or sand with root tabs
• Lighting: moderate LED on 10‑12 hours (promotes faster growth)
• No fish – only snails or shrimp (cleaners)
• Liquid fertilizer: Dose weekly at recommended levels

Grow‑out tanks allow you to propagate without disturbing your main display. Once plants are established, you can sell or trade them.

• Cutting too short: Cuttings should be at least 4 inches – shorter plants struggle to establish.
• Burying the rhizome: Java fern and Anubias rot if buried – attach them instead.
• Poor water quality: Propagating plants need clean, nutrient‑rich water.
• Not trimming mother plants: Remove old, decaying leaves to direct energy to new growth.

Propagation is not just cost‑effective – it’s deeply satisfying. There’s something magical about watching a single cutting grow into a thriving plant that you can then divide again, expanding your underwater garden completely free.