How to propagate goldfish plant

Nematanthus gregarius

Propagate goldfish plant by stem cutting. Roots in 14 to 28 days in water. The cutting must include a node.

PREFERRED METHOD

stem cutting

The only method that works reliably for this species.

TIME TO ROOT

14–28 days

Roughly 2 to 4 weeks — fast for a houseplant. 69 of the 100 species in this database root more slowly.

NODE REQUIRED

Yes

A cutting without a node has no tissue that can become root and will rot instead.

MEDIUM

water or soil

Water roots are more brittle than soil roots and sulk for a week or two after potting up. Both work; soil skips the transition.

BEST SEASON

Spring and summer

Cuttings taken in active growth root faster and rot less than winter ones.

GROWTH HABIT

trailing

Habit is what decides which methods are available at all.

Why stem cutting works here

Roots form at the node — the slightly swollen point where a leaf meets the stem. That tissue can still turn into root tissue; the smooth stem between nodes cannot.

Doing it

Cut a few millimetres below a node with at least one leaf above it. Strip anything that would sit underwater. Put the node in the medium, the leaf in the light.

Where it goes wrong

A cutting with no node will sit green for weeks and then rot. It is the commonest way to waste a month.

Before you cut

Sap is not a concern here. Goldfish plant is listed non-toxic to cats and dogs, so offcuts and rooting jars are lower risk than with most houseplants.
Take more than you need. Losses are normal. Three cuttings in one jar costs nothing extra and changes the odds.
Use a clean blade. Scissors crush the stem and crushed tissue rots. A craft knife wiped with alcohol is enough.
Do not fertilise a cutting. There are no roots to take it up, and the salts sit in the medium and burn what does form.

Also for this species

Full care entry — light, watering interval, soil recipe and difficulty, with sources. Toxicity to cats and to dogs.

Sources

Royal Botanic Gardens Kew, Plants of the World Online — Nematanthus gregarius Accepted name and family. Checked 2026-09-12.
ASPCA Animal Poison Control — Nematanthus gregarius Toxicity of sap and offcuts. Checked 2026-09-12.
Wikidata entity Q10646907

Compiled and edited by Tony Valcarcel · 2026-09-12
Rooting times are typical ranges for indoor conditions, not guarantees. Warmth and light move them more than anything you do to the cutting. How this is sourced.