Repotting guide

When & how to repot Spike lavender (Lavandula latifolia)

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)

Watch for — Root and crown rot: The most common cause of plant death — caused by waterlogged soil or heavy clay. Ensure drainage is sharp; raised beds or gravel mulch can help in wet UK gardens.

How to tell spike lavender needs repotting

Repotting on a calendar is less reliable than reading the plant. For spike lavender, watch for these signs:

Roots growing out of the drainage holes, or the rootball lifting the plant proud of the rim.
Soil that has shrunk away from the pot sides and no longer holds water.
The pot is unstable because the plant has grown top-heavy.
Old, compacted, broken-down mix that stays wet too long — for a succulent that is a rot risk, so refresh it even if the pot size is fine.

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot spike lavender

Every 2–3 years, into bone-dry mix. Spike lavender's growth habit — upright, woody-based evergreen subshrub forming a dense mound of grey-green, broad, linear leaves with tall erect flower spikes rising above the foliage — sets the pace. 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.

What size pot to step spike lavender up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Spike lavender stores water and rots in a large pot of slow-drying soil. A tight terracotta pot that dries fast is far safer than a generous plastic one. Never up-pot a succulent by several sizes.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot spike lavender

Spring or summer, while spike lavender is in active growth and warm, is best — roots recover fastest then, and the plant is not sitting in cool damp soil. Avoid repotting a succulent in winter dormancy.

Step-by-step: repotting spike lavender

Repot dry. Do not water spike lavender for several days first. Working with dry roots and dry mix dramatically lowers the rot risk for a succulent.
Pick a snug, fast-draining pot. Choose terracotta one size up at most, with a drainage hole. Have gritty lean, sharply drained alkaline to neutral loam or sandy soil; ph 6.5–7.5 ready.
Tip it out and clean the roots. Slide the plant out, crumble off the old soil, and trim any black, mushy or dead roots with clean snips.
Pot into dry mix. Set spike lavender at its original depth in dry gritty mix, firming gently. Do not bury the stem deeper than it was.
Wait a week before watering. Leave it completely dry and out of harsh sun for about 7 days so any damaged roots callus. Only then water lightly.

Aftercare

Keep spike lavender completely dry and out of fierce sun for about a week so any nicked roots callus before they meet moisture; watering a freshly repotted succulent is the classic way to rot it. Then resume the normal lean, dry rhythm. Do not fertilise for about 3 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for spike lavender

Spike lavender wants lean, sharply drained alkaline to neutral loam or sandy soil; ph 6.5–7.5. Thrives in poor, gritty or sandy soils that larger perennials struggle in. Avoid clay and rich, moisture-retentive mixes. Incorporate horticultural grit liberally when planting in heavier UK soils. Never mulch directly against the crown. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting spike lavender — frequently asked questions

How often should you repot spike lavender?

Every 2–3 years, into bone-dry mix for spike lavender. Repot spike lavender every 2–3 years into a snug pot of lean, sharply drained alkaline to neutral loam or sandy soil; ph 6.5–7.5, ideally in spring or summer. Let it sit in dry soil and do not water for about a week afterwards so any nicked roots can callus. Over-potting and watering straight away is what rots succulents.

What size pot does spike lavender need?

When is the best time of year to repot spike lavender?

Should you water spike lavender after repotting?

No — not straight away. Repot spike lavender into dry mix and wait about a week before the first watering so any damaged roots callus over. Watering a freshly repotted succulent is the single most common way to rot one.

Should you fertilise spike lavender after repotting?

Not immediately. Wait about 3 weeks after repotting spike lavender. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.