Mature size & growth rate

How big does Lemon Catnip (Nepeta cataria 'Citriodora') get?

Also called Lemon Catnip, Citron Catnip.

More about lemon catnip

About Lemon Catnip

Nepeta cataria 'Citriodora' · also called Lemon Catnip, Citron Catnip · herb

Lemon Catnip is a lemon-scented cultivar of common catnip that is less attractive to cats than the species. It thrives in full sun with well-drained soil and is drought-tolerant once established. Bees and butterflies love it. Cut back after flowering to encourage a second flush and prevent self-seeding.

Mature size: 60–90 cm tall, 45–60 cm wide

Watch for — Floppy, sprawling stems: Caused by too much shade or over-fertilising with nitrogen. Move to full sun and cut back to 10 cm after the first flush to stimulate compact regrowth.

Indoor size vs how big it gets in the wild

Lemon Catnip 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 60–90 cm tall, 45–60 cm 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

Lemon Catnip 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: apply a balanced, low-nitrogen fertiliser (e.g. 5-10-10) once in early spring. avoid high-nitrogen feeds, which produce soft, floppy stems susceptible to lodging and disease.

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

How to keep lemon catnip smaller

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

The decisive tool is the secateurs: lemon catnip 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 lemon catnip 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 lemon catnip bigger or faster

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

When lemon catnip outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for lemon catnip:

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

Lemon Catnip size — frequently asked questions

How big does lemon catnip get?

Lemon Catnip reaches 60–90 cm tall, 45–60 cm 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 lemon catnip slow or fast growing?

Lemon Catnip is a moderate grower. Expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Lemon Catnip grows on a tree's timeline and scale — indoors it becomes a tall, trunked statement plant rather than a tabletop one.

How long does lemon catnip 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 lemon catnip smaller?

The decisive tool is the secateurs: lemon catnip 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 lemon catnip 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.