Propagation Lab

Propagation Lab

Stem cuttings in water

The classic jar on the windowsill — watch roots form in real time.

Best season

Spring to early autumn, when the plant is actively growing. Possible in winter, just slower.

Roots in

1–4 weeks for pothos and philodendron; 3–8 weeks for monstera and hoya.

You'll need

  • Clean sharp scissors or a blade
  • A clear jar or glass
  • Room-temperature water
  • Bright light with no direct sun

Step by step

  1. 1

    Find a node

    A node is the slightly swollen joint where a leaf meets the stem, often with a small brown bump (an aerial root nub). Roots only grow from nodes — a leaf on a bare stem with no node will never root.

  2. 2

    Cut below the node

    Cut about 1 cm (½ in) below a node with a clean blade. Take a piece with 1–3 leaves. Remove any leaf that would sit under water.

  3. 3

    Let it rest a moment

    For pothos and philodendron, straight into water is fine. For thicker stems, let the cut dry for 30 minutes so it seals.

  4. 4

    Submerge the node, not the leaves

    Water should cover the node and bare stem only. Leaves in water rot and foul the jar.

  5. 5

    Bright, indirect light and patience

    A north or east sill, or a metre back from a south window. Top up water as it evaporates; change it fully every 5–7 days.

  6. 6

    Pot up at 3–5 cm of root

    Once roots are 3–5 cm (1–2 in) long, ideally with side branches, pot into a small container of airy, moist mix. Keep it moist, not wet, for two weeks while water roots adapt to soil.

Why?

Water gives roots oxygen and moisture with zero resistance, which is why it is the most forgiving start. The trade-off is that water roots are built for water; the plant must grow a second set for soil, which is why the pot-up stage is where most water cuttings are lost.

What success looks like

  • Days 1–5Nothing visible. The cut end may callus and the water may turn slightly cloudy — change it.
  • Week 1–2White bumps appear at the node; first root tips push out. Pothos is often here by day 10.
  • Week 2–4Roots lengthen to a few centimetres. A new leaf may begin to unfurl at the tip.
  • Week 4–8Roots branch. This is the pot-up window — longer than 10 cm and the transition to soil gets harder.

When it goes wrong

  • Stem turns brown and mushy from the bottom

    Why: Bacterial rot from stale water or a cut that was crushed rather than sliced.

    Fix: Cut back to firm green tissue above the rot, rinse, use fresh water and a clean jar. Change water more often.

  • Weeks pass and nothing happens

    Why: No node under the water, too cold, or too dark.

    Fix: Check for a node. Move somewhere warmer and brighter — 20–25 °C (68–77 °F) is the sweet spot.

  • Cutting wilts after potting up

    Why: Water roots are thin and brittle; they need time to grow soil roots.

    Fix: Keep the mix evenly moist and the air humid (a clear bag or cloche) for the first two weeks.

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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