Mature size & growth rate

How big does Finger Lime (Microcitrus australasica) get?

Also called finger lime, Australian finger lime, citrus caviar.

More about finger lime

About Finger Lime

Microcitrus australasica · also called finger lime, Australian finger lime · edible

The Australian finger lime is a thorny rainforest citrus prized for its caviar-like vesicle pearls that burst with tart juice. Slow-growing and frost-tender, it thrives in a sheltered, sunny spot or a large container moved indoors over winter. Expect fruit from late autumn, with cultivars ranging from green to crimson pulp.

Mature size: 2-4 m tall in the ground (often kept to 1.5-2 m in containers), spreading 1-3 m wide.

Watch for — Citrus leaf miner: Silvery serpentine trails distort new flushes; prune affected tips and protect tender spring growth in warm climates.

Indoor size vs how big it gets in the wild

Finger Lime 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 2-4 m tall in the ground (often kept to 1.5-2 m in containers), spreading 1-3 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

Finger Lime 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: feed with a high-nitrogen citrus fertiliser fortnightly from spring through late summer, switching to a winter citrus feed in the cool months. watch for magnesium and iron deficiency (interveinal yellowing) and correct with chelated micronutrients.

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

How to keep finger lime smaller

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

The decisive tool is the secateurs: finger lime 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 finger lime 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 finger lime bigger or faster

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

When finger lime outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for finger lime:

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

Finger Lime size — frequently asked questions

How big does finger lime get?

Finger Lime reaches 2-4 m tall in the ground (often kept to 1.5-2 m in containers), spreading 1-3 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 finger lime slow or fast growing?

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

How long does finger lime 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 finger lime smaller?

The decisive tool is the secateurs: finger lime 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 finger lime 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.