Mature size & growth rate

How big does Incense Cedar (Calocedrus decurrens) get?

Also called Incense Cedar, California Incense Cedar.

More about incense cedar

About Incense Cedar

Calocedrus decurrens · also called Incense Cedar, California Incense Cedar · flowering

Incense Cedar is a tall, columnar conifer native to mountain forests of Oregon and California, instantly recognised by its narrowly cylindrical crown and aromatic, cedarwood-scented scale foliage. Remarkably adaptable, it grows in a wide range of soils and withstands both drought and moderate shade. It is the wood behind most wooden pencils and excellent as a landscape specimen.

Mature size: 15–40 m tall by 3–5 m wide in the wild; typically 10–20 m tall in cultivation gardens

Indoor size vs how big it gets in the wild

Incense Cedar is a tree at heart. Indoors a pot and your ceiling keep it to 15–40 m tall by 3–5 m wide in the wild, but in the ground it is a different scale of plant entirely (typically 10–20 m tall in cultivation gardens). Indoors and in a pot, expect 15–40 m tall by 3–5 m wide in the wild. In the ground with no restriction it is a completely different plant — typically 10–20 m tall in cultivation gardens — 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

Incense Cedar is a moderate grower. Realistically, expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Its feeding profile backs this up: light feeder — an annual application of slow-release balanced fertiliser in early spring is sufficient. avoid high-nitrogen feeds, which can promote excessive soft growth. in nutrient-poor soils, a supplemental feed in early summer may be beneficial.

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

How to keep incense cedar smaller

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

The decisive tool is the secateurs: incense cedar 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.
Expect to top or hard-prune it every year or two — left alone it heads for the ceiling.

The keep-it-smaller method, step by step

Pick the new height. Decide how tall you want incense cedar 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 incense cedar bigger or faster

If you want it to fill the space sooner, push the conditions rather than hoping — for incense cedar 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 incense cedar light requirements page covers exactly how bright a spot it needs to grow at its potential instead of stalling.

When incense cedar outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for incense cedar:

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 incense cedar repotting guide. If you want more of this plant instead of a bigger one, the incense cedar propagation guide turns prunings into new plants.

Incense Cedar size — frequently asked questions

How big does incense cedar get?

Incense Cedar reaches 15–40 m tall by 3–5 m wide in the wild when grown indoors, and far larger where it grows unrestricted (typically 10–20 m tall in cultivation gardens). 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 incense cedar slow or fast growing?

Incense Cedar is a moderate grower. Expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Incense Cedar is a tree at heart. Indoors a pot and your ceiling keep it to 15–40 m tall by 3–5 m wide in the wild, but in the ground it is a different scale of plant entirely (typically 10–20 m tall in cultivation gardens).

How long does incense cedar take to reach full size?

Roughly three to six years to reach mature indoor size, gaining a steady amount each growing season. Light, pot size and feeding move that timeline more than anything else.

How do I keep incense cedar smaller?

The decisive tool is the secateurs: incense cedar 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. Expect to top or hard-prune it every year or two — left alone it heads for the ceiling.

How can I make incense cedar 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.