Mature size & growth rate

How big does Spike lavender (Lavandula latifolia) get?

Also called Spike lavender, Broad-leaved lavender, Portuguese lavender.

More about spike lavender

About Spike lavender

Lavandula latifolia · also called Spike lavender, Broad-leaved lavender · herb

Spike lavender is a robust, camphor-scented Mediterranean herb valued for its essential oil and tall flower spikes. It thrives in full sun with sharply drained, poor-to-average soil and extreme drought tolerance once established. Slightly coarser than English lavender, it blooms mid to late summer and tolerates hotter, more humid summers than its relatives.

Mature size: 60–90 cm tall and 60–90 cm wide (24–36 in)

Indoor size vs how big it gets in the wild

Spike lavender is a garden shrub whose final size is set more by your secateurs than by the plant — pruning, not luck, decides how big it gets. Indoors and in a pot, expect 60–90 cm tall and 60–90 cm wide (24–36 in). 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.

Left unpruned it builds a woody framework that gets taller and wider every year; with annual pruning you hold it at whatever size suits the space.

Growth rate and years to mature

Spike lavender 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 low-nitrogen, high-potassium fertiliser (tomato feed) once in early spring, if at all. rich feeding produces lush, soft growth prone to disease and reduces flowering and essential oil concentration. established plants in well-chosen sites need no feeding.

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

How to keep spike lavender smaller

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

Prune spike lavender annually at the right time for its type — this is the primary, expected way to control its size.
Remove the oldest, thickest stems at the base each year to keep it open and within bounds.
Growing it in a large container rather than open ground naturally restricts the ultimate size.
Avoid heavy feeding if you want to limit growth — rich soil and lots of nitrogen drive bigger, faster shrubs.

The keep-it-smaller method, step by step

Prune at the right time. Time the cut to spike lavender's type (after flowering for many spring shrubs, late winter for summer-flowering ones) so you do not lose the next display.
Take out the oldest stems. Remove up to a third of the oldest, thickest stems at the base to renew the shrub and contain it.
Shorten the rest. Cut the remaining stems back to an outward-facing bud at the height and width you want.
Restrict the roots. For a permanent size cap, grow it in a large container rather than open ground.

How to grow spike lavender bigger or faster

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

Plant it in open ground in good soil — far more vigorous than a container-restricted plant.
Full sun (which it wants) plus an annual mulch and feed gives the strongest growth.
Water well through the first establishment years; a settled root system drives the fastest size gain.

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

When spike lavender outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for spike lavender:

It shades or crowds neighbouring plants, or blocks a path it used to clear.
Bare, woody, unproductive centres with growth only on the outside — a sign it needs renovation pruning.
It has clearly exceeded the space you allotted and an annual trim no longer holds it.

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

Spike lavender size — frequently asked questions

How big does spike lavender get?

Spike lavender reaches 60–90 cm tall and 60–90 cm wide (24–36 in) when grown indoors. Left unpruned it builds a woody framework that gets taller and wider every year; with annual pruning you hold it at whatever size suits the space.

Is spike lavender slow or fast growing?

Spike lavender is a moderate grower. Expect three to six years to reach mature indoor size, gaining a steady amount each growing season. Spike lavender is a garden shrub whose final size is set more by your secateurs than by the plant — pruning, not luck, decides how big it gets.

How long does spike lavender 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 spike lavender smaller?

Prune spike lavender annually at the right time for its type — this is the primary, expected way to control its size. Remove the oldest, thickest stems at the base each year to keep it open and within bounds. Growing it in a large container rather than open ground naturally restricts the ultimate size. Avoid heavy feeding if you want to limit growth — rich soil and lots of nitrogen drive bigger, faster shrubs.

How can I make spike lavender grow bigger or faster?

Plant it in open ground in good soil — far more vigorous than a container-restricted plant. Full sun (which it wants) plus an annual mulch and feed gives the strongest growth. Water well through the first establishment years; a settled root system drives the fastest size gain.