Mature size & growth rate

How big does Pencil Pine (Athrotaxis cupressoides) get?

Also called pencil pine, Tasmanian pencil pine.

More about pencil pine

About Pencil Pine

Athrotaxis cupressoides · also called pencil pine, Tasmanian pencil pine · flowering

Pencil pine is a slow-growing, very long-lived evergreen conifer endemic to Tasmania's alpine highlands. It forms a neat, narrow column of tightly overlapping, scale-like cypress-like foliage on cord-like branchlets. A cool-climate moisture lover, it needs constantly damp, acidic, free-draining peaty soil, high humidity, and shelter, and strongly resents heat, drought, and dry air.

Mature size: In cultivation commonly 3-8 m tall and 1.5-3 m wide over many decades; ancient wild specimens reach 6-12 m and can live over a thousand years.

Watch for — Extremely slow growth: It puts on very little height each year, testing gardeners' patience. Steady moisture and shelter give the best, if modest, growth.

Indoor size vs how big it gets in the wild

Pencil Pine is a tree at heart. Indoors a pot and your ceiling keep it to in cultivation commonly 3-8 m tall and 1.5-3 m wide over many decades, but in the ground it is a different scale of plant entirely (ancient wild specimens reach 6-12 m and can live over a thousand years.). Indoors and in a pot, expect in cultivation commonly 3-8 m tall and 1.5-3 m wide over many decades. In the ground with no restriction it is a completely different plant — ancient wild specimens reach 6-12 m and can live over a thousand years. — which is why the pot, the light and the pruning matter so much for the size you actually end up with.

It gains real height on a trunk or main stem, adding a tier of leaves a year and eventually reaching for the ceiling — this is a plant you grow up, not out.

Growth rate and years to mature

Pencil Pine is a slow grower. Realistically, expect a decade or more — slow growers like this add only a few centimetres a year, so expect 8-15+ years to reach their indoor ceiling. Its feeding profile backs this up: a frugal feeder suited to nutrient-poor alpine soils. give only a light spring application of slow-release acidic fertiliser if growth is weak; an organic leaf-mould mulch usually suffices.

Want this turned into the right next pot at the right moment? The pot size calculator and the pencil pine repotting guide cover when and how much to size up — pot size is one of the biggest levers on how fast pencil pine grows.

How to keep pencil pine smaller

You are not stuck with the maximum size. For pencil pine specifically, these are the levers, in order of impact:

The decisive tool is the secateurs: pencil pine can be topped (cut the main growing tip) to cap its height and force a bushier, shorter shape.
Keeping it deliberately pot-bound in a snug container slows the whole plant and limits ultimate size.
Prune in spring so it heals fast; remove the tallest leader back to a node to reset the height.
Good news: slow growth means topping it once buys you years before it needs doing again.

The keep-it-smaller method, step by step

Pick the new height. Decide how tall you want pencil pine and find a leaf node or branch point just below that.
Top the main stem. Cut the main growing tip cleanly just above that node in spring; this permanently caps the height and forces side branches.
Keep the pot snug. Avoid jumping to a much bigger pot — a slightly restricted rootball keeps the whole plant smaller.
Maintain the shape. Prune back the tallest new leaders each spring to hold it at the height you chose.

How to grow pencil pine bigger or faster

If you want it to fill the space sooner, push the conditions rather than hoping — for pencil pine the accelerators are:

It already wants the bright light it needs; warmth, a yearly pot-up and spring-summer feed are the accelerators.
Pot up a size every year or two while young; restricted roots are the main thing holding height back.
Feed regularly through the growing season and keep it warm — height comes from sustained good conditions.

Light is almost always the ceiling. The pencil pine light requirements page covers exactly how bright a spot it needs to grow at its potential instead of stalling.

When pencil pine outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for pencil pine:

The top leaves pressing against or bent by the ceiling — the classic "this is now too tall indoors" sign.
It has to be moved away from a light source it has literally outgrown.
Roots filling the largest pot you can reasonably keep indoors — at that point it is top-or-prune or move it outside (if hardy).

If it is the pot rather than the room, it is a repotting job, not a goodbye — see the pencil pine repotting guide. If you want more of this plant instead of a bigger one, the pencil pine propagation guide turns prunings into new plants.

Pencil Pine size — frequently asked questions

How big does pencil pine get?

Pencil Pine reaches in cultivation commonly 3-8 m tall and 1.5-3 m wide over many decades when grown indoors, and far larger where it grows unrestricted (ancient wild specimens reach 6-12 m and can live over a thousand years.). It gains real height on a trunk or main stem, adding a tier of leaves a year and eventually reaching for the ceiling — this is a plant you grow up, not out.

Is pencil pine slow or fast growing?

Pencil Pine is a slow grower. Expect a decade or more — slow growers like this add only a few centimetres a year, so expect 8-15+ years to reach their indoor ceiling. Pencil Pine is a tree at heart. Indoors a pot and your ceiling keep it to in cultivation commonly 3-8 m tall and 1.5-3 m wide over many decades, but in the ground it is a different scale of plant entirely (ancient wild specimens reach 6-12 m and can live over a thousand years.).

How long does pencil pine take to reach full size?

Roughly a decade or more — slow growers like this add only a few centimetres a year, so expect 8-15+ years to reach their indoor ceiling. Light, pot size and feeding move that timeline more than anything else.

How do I keep pencil pine smaller?

The decisive tool is the secateurs: pencil pine can be topped (cut the main growing tip) to cap its height and force a bushier, shorter shape. Keeping it deliberately pot-bound in a snug container slows the whole plant and limits ultimate size. Prune in spring so it heals fast; remove the tallest leader back to a node to reset the height. Good news: slow growth means topping it once buys you years before it needs doing again.

How can I make pencil pine grow bigger or faster?

It already wants the bright light it needs; warmth, a yearly pot-up and spring-summer feed are the accelerators. Pot up a size every year or two while young; restricted roots are the main thing holding height back. Feed regularly through the growing season and keep it warm — height comes from sustained good conditions.