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Repotting guide

When & how to repot Bunya Pine (Araucaria bidwillii)

Also called bunya pine, bunya-bunya, bunya nut.

More about bunya pine

About Bunya Pine

Araucaria bidwillii · also called bunya pine, bunya-bunya · edible

The bunya pine is a towering Australian conifer famed for its enormous cones, which can weigh up to 10 kg and hold dozens of large, starchy edible nuts traditionally feasted on by Aboriginal peoples. A warm-temperate to subtropical tree with a strikingly symmetrical dark-green crown, it needs full sun, deep rich soil, and a lot of room.

Mature size: Commonly 30-45 m tall in habitat and 10-15 m wide; a massive long-lived tree unsuited to small gardens.

How to tell bunya pine needs repotting

Repotting on a calendar is less reliable than reading the plant. For bunya pine, watch for these signs:

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot bunya pine

Pot on seedlings as they grow; not a perennial repot. Bunya Pineis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Slow-to-moderate, very tall evergreen conifer with a domed, symmetrical crown of whorled branches and a straight central trunk; juvenile and adult foliage differ in form..

What size pot to step bunya pine up to

Pot bunya pine on gradually — a seedling jumped straight into a huge pot sits in cold, wet, airless soil and stalls. Step up one or two sizes at a time as the roots fill each container, finishing in a large final pot or the ground. The aim is roots that never circle and never check.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot bunya pine

Pot bunya pine on through the active growing season, whenever roots fill the current container — there is no single date, just "before it becomes root-bound". Avoid potting on during a cold snap.

Step-by-step: repotting bunya pine

  1. Pot on before it is root-bound. Check bunya pine regularly; move it up as soon as roots reach the edge of the cell or pot, not after they have circled.
  2. Step up one or two sizes. Choose the next container up — not a giant one. Cold, wet, unused soil around a small root system stalls seedlings.
  3. Knock it out gently. Support the stem, tip the pot, and ease the rootball out without breaking it. A little teasing of circled roots at the base is fine.
  4. Pot into rich mix. Set it into fresh deep, fertile, well-drained loam at the same depth (tomatoes are the exception — they can go deeper to root along the stem).
  5. Water in and grow on. Water well, keep it in good light, and resume feeding once it is established and growing again.

Aftercare

Water bunya pine in well and keep it in bright light; a freshly potted-on seedling can wilt for a day while roots settle, so do not overcompensate by drowning it. Do not fertilise for about 1 week — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for bunya pine

Bunya Pine wants deep, fertile, well-drained loam. Prefers a rich, moisture-retentive but free-draining soil and grows fastest on good ground. Tolerates a range of soils if drainage is adequate; dislikes thin, dry or compacted sites. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting bunya pine — frequently asked questions

How often should you repot bunya pine?

Pot on seedlings as they grow; not a perennial repot for bunya pine. Bunya Pine is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into deep, fertile, well-drained loam so the roots never circle the cell, ending in a large final container. A root-bound transplant stalls and never fully recovers.

What size pot does bunya pine need?

Pot bunya pine on gradually — a seedling jumped straight into a huge pot sits in cold, wet, airless soil and stalls. Step up one or two sizes at a time as the roots fill each container, finishing in a large final pot or the ground. The aim is roots that never circle and never check. Use our pot size calculator to size it from the plant's current pot and root spread.

When is the best time of year to repot bunya pine?

Pot bunya pine on through the active growing season, whenever roots fill the current container — there is no single date, just "before it becomes root-bound". Avoid potting on during a cold snap.

Can you put bunya pine straight into a much bigger pot?

No. Even a fast-growing bunya pine should only go up one pot size at a time. A vastly oversized pot holds a reservoir of wet soil the roots cannot reach, which stays cold and soggy and rots the roots — the opposite of what you wanted.

Should you fertilise bunya pine after repotting?

Not immediately. Wait about 1 week after repotting bunya pine. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.

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