Mature size & growth rate

How big does Atlas Cedar (Cedrus atlantica) get?

Also called Atlas Cedar, Blue Atlas Cedar.

More about atlas cedar

About Atlas Cedar

Cedrus atlantica · also called Atlas Cedar, Blue Atlas Cedar · flowering

Atlas Cedar is a stately North African conifer from the Atlas Mountains of Morocco and Algeria, celebrated for its distinctive blue-green to silver-blue foliage and broadly spreading, irregular crown with age. Hardy and drought-tolerant once established, it is a classic specimen tree for large gardens across USDA zones 6–9. The weeping cultivar 'Glauca Pendula' is widely grown.

Mature size: 15–30 m tall, 6–12 m wide

Indoor size vs how big it gets in the wild

Atlas Cedar grows on a tree's timeline and scale — indoors it becomes a tall, trunked statement plant rather than a tabletop one. Indoors and in a pot, expect 15–30 m tall, 6–12 m wide. A pot, your light levels and a little pruning are what set the final size in a home, far more than the plant's theoretical potential.

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

Atlas Cedar 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: established trees rarely need fertilising on suitable soils. young trees benefit from a slow-release balanced fertiliser in early spring for 2–3 years after planting. avoid high-nitrogen feeds, which reduce drought tolerance and blue foliage colour.

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

How to keep atlas cedar smaller

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

The decisive tool is the secateurs: atlas 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.
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 atlas 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 atlas cedar bigger or faster

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

When atlas cedar outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for atlas 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 atlas cedar repotting guide. If you want more of this plant instead of a bigger one, the atlas cedar propagation guide turns prunings into new plants.

Atlas Cedar size — frequently asked questions

How big does atlas cedar get?

Atlas Cedar reaches 15–30 m tall, 6–12 m wide when grown indoors. 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 atlas cedar slow or fast growing?

Atlas Cedar 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. Atlas Cedar grows on a tree's timeline and scale — indoors it becomes a tall, trunked statement plant rather than a tabletop one.

How long does atlas cedar 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 atlas cedar smaller?

The decisive tool is the secateurs: atlas 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. Good news: slow growth means topping it once buys you years before it needs doing again.

How can I make atlas 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.