How to propagate boston fern

Nephrolepis exaltata

Propagate boston fern by division. Roots in 21 to 42 days in soil. No node needed.

PREFERRED METHOD

division

Also possible: runners.

TIME TO ROOT

21–42 days

Roughly 3 to 6 weeks — middling for a houseplant. 14 of the 40 species in this database root more slowly.

NODE REQUIRED

Roots form from the cut tissue itself, so there is no node to find.

MEDIUM

soil

Not a water-rooting species. Keep the medium barely damp rather than wet.

BEST SEASON

Spring and summer

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

GROWTH HABIT

spreading

Habit is what decides which methods are available at all.

Why division works here

Not propagation from scratch so much as separation. Each piece already has its own roots and growing point, which is why the success rate is close to total.

Doing it

Unpot, find where the clumps separate naturally, and pull them apart by hand. Cut only what will not yield.

Where it goes wrong

Dividing too small is the usual error. A division needs enough roots to support its own leaves from day one.

The other routes

Slower or lower-yield for this species, but each has a case.

runners

Plantlets arrive pre-formed on a stolon, already carrying leaf and root initials before they touch soil. Cutting first and rooting after works too, just slower and with more losses.

DISPLAY — in-content responsive

Before you cut

Sap is not a concern here. Boston fern 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

Missouri Botanical Garden Plant Finder — Nephrolepis exaltata Cultivation and propagation notes. Checked 2026-09-11.
Royal Botanic Gardens Kew, Plants of the World Online — Nephrolepis exaltata Accepted name and family. Checked 2026-09-11.
ASPCA Animal Poison Control — Nephrolepis exalta bostoniensis Toxicity of sap and offcuts. Checked 2026-09-11.
Wikidata entity Q136883

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.