Propagation Lab

Propagation Lab

Stem cuttings in soil or moss

Root straight into the medium the plant will live in — no transplant shock.

Best season

Spring and summer. Bottom warmth helps in cooler months.

Roots in

2–6 weeks depending on species and warmth.

You'll need

  • Clean blade
  • Small pot or tray
  • Airy mix: perlite and coir/peat 1:1, or damp sphagnum moss
  • Clear bag, cloche or propagator
  • Optional: rooting hormone

Step by step

  1. 1

    Take a cutting with a node

    As with water cuttings: 1 cm below a node, 1–3 leaves, lower leaves removed.

  2. 2

    Dip if you like

    Rooting hormone powder or gel on the cut end speeds rooting on woody or slow plants. Optional for pothos and philodendron.

  3. 3

    Make a hole first, then insert

    Use a pencil to make the hole so the hormone is not scraped off. Bury the node 2–3 cm deep and firm gently.

  4. 4

    Water once, then cover

    Water lightly so the mix is damp not soggy. Cover with a clear bag propped on sticks, or a cloche, to hold humidity around the leaves while there are no roots.

  5. 5

    Warmth and bright shade

    20–25 °C (68–77 °F); a heat mat underneath helps enormously in cool rooms. Bright, indirect light.

  6. 6

    Air daily and watch for resistance

    Open the cover a few minutes daily to prevent mould. After 3 weeks, a gentle tug that meets resistance means roots.

Why?

Soil cuttings never have to switch root types, so they establish faster once rooted. The price is that you cannot see progress, and a leafy cutting with no roots loses water quickly — which is exactly what the humidity cover is for.

What success looks like

  • Week 1Leaves stay firm inside the humid cover. Slight yellowing of a lower leaf is normal.
  • Week 2–4Callus then roots form unseen. Tug test begins to resist.
  • Week 4–6New leaf at the tip is the surest sign of roots. Begin opening the cover for longer each day.
  • Week 6–8Cover off; treat as a young plant. Pot on when roots fill the small container.

When it goes wrong

  • Cutting collapses and blackens at soil level

    Why: Mix too wet and cold — stem rot.

    Fix: Use a lighter mix, water less, add bottom heat.

  • Grey fuzz on leaves

    Why: Botrytis in an unventilated cover.

    Fix: Air daily; remove affected leaves; give a little more light.

  • Cutting dries and crisps

    Why: Humidity cover missing or too much sun through the plastic.

    Fix: Cover it; move out of direct sun (plastic in sun cooks cuttings).

Plants that suit this method

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Other methods

Every timeline here is a typical range. Your room's warmth and light set the real pace — that is why the Lab asks you to log the start and watch, rather than count days.

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