Propagation Lab

Propagation Lab

Offsets, pups and plantlets

The plant does the work — you just detach the baby at the right moment.

Best season

Any time the pup is big enough; spring is gentlest.

Roots in

Plantlets on runners often have roots already. Pups from the base: 2–6 weeks.

You'll need

  • Clean blade
  • Small pot
  • Airy mix

Step by step

  1. 1

    Wait until the pup is a third the size of the parent

    A pup that is too small has no reserves. For spider plant babies, wait until little root nubs show at the base.

  2. 2

    Root while attached if you can

    Pin a spider plant or strawberry begonia plantlet onto a pot of mix beside the parent while still on its runner; cut the runner once it has rooted.

  3. 3

    Detach cleanly

    For pups at the base (aloe, bromeliads, pilea, snake plant), tip out the parent and cut the pup away with as many of its own roots as possible.

  4. 4

    Callus succulent pups

    Aloe and agave pups: let the cut dry a day or two before potting.

  5. 5

    Pot small and water lightly

    A pot just larger than the pup's roots; water sparingly until new growth shows.

Why?

Offsets are the plant's own propagation strategy, complete with a nutrient lifeline from the parent. Leaving the pup attached as long as possible lets the parent fund its roots — which is why patience here beats every trick.

What success looks like

  • Week 1–2Pup may sulk slightly. Soft-leaved pups appreciate a humidity cover.
  • Week 2–6Roots establish; a tug meets resistance.
  • Month 2+New leaves from the centre — established.

When it goes wrong

  • Pup rots at the base

    Why: Detached too small, or potted wet without roots.

    Fix: Leave pups longer next time; root rootless pups in perlite with a cover, not in wet soil.

  • Parent bromeliad dies after pupping

    Why: That is what bromeliads do — the mother flowers once and fades as pups take over.

    Fix: Nothing to fix; keep the pups.

Plants that suit this method

  • Snake plant
  • Spider plant
  • Pilea peperomioides
  • Aloe
  • Haworthia
  • Bromeliads
  • Strawberry begonia
  • Snake plant rhizome pups
  • Kalanchoe plantlets
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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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