Repotting guide

When & how to repot Woolly Lavender (Lavandula lanata)

Also called Woolly lavender, White-woolly lavender.

More about woolly lavender

About Woolly Lavender

Lavandula lanata · also called Woolly lavender, White-woolly lavender · herb

A distinctive Spanish mountain lavender with conspicuously white-woolly stems and broad silver-white leaves that give the plant a striking textural appearance unlike any other lavender. It produces long, slender spikes of deep violet-purple, strongly fragrant flowers in summer and is moderately cold-hardy for a Mediterranean species. Sharp drainage and full sun are non-negotiable; this species comes from high-altitude, dry limestone habitats in southern Spain. Lavender is toxic to cats, dogs, and horses according to the ASPCA.

Mature size: 60–75 cm tall and 60–75 cm wide (24–30 in × 24–30 in).

Watch for — Root and crown rot in wet winters: The primary cause of loss in UK gardens; sitting water at the crown during cold spells kills quickly. Grow in raised beds or containers with extra grit, and shelter from prolonged winter rain.

How to tell woolly lavender needs repotting

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

A dense root mass with little soil visible when you ease woolly lavender out of its pot — check once a year rather than assuming.
Roots emerging from the drainage holes (slow on this plant, so this is a strong signal).
The plant has become top-heavy and tips its pot over.
Genuinely stalled growth across a full season despite adequate light — not just the naturally slow pace this plant always has.

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 woolly lavender

Every 2–4 years — it is in no hurry. Woolly Lavender's growth habit — compact, upright, evergreen dwarf shrub with distinctively broad, white-felted leaves and tall, slender flowering spikes. — sets the pace. A distinctive Spanish mountain lavender with conspicuously white-woolly stems and broad silver-white leaves that give the plant a striking textural appearance unlike any other lavender. It produces long, slender spikes of deep violet-purple, strongly fragrant flowers in summer and is moderately cold-hardy for a Mediterranean species. Sharp drainage and full sun are non-negotiable; this species comes from high-altitude, dry limestone habitats in southern Spain. Lavender is toxic to cats, dogs, and horses according to the ASPCA.

What size pot to step woolly lavender up to

Step up just one pot size, and only when the roots are genuinely packed. Because woolly lavender grows so slowly, a big pot of damp soil will simply sit wet for months around a small root system and invite rot. A snug pot suits this plant; resist the urge to "give it room to grow" — it will not use it.

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 woolly lavender

Early spring, just as new growth restarts, is the ideal window for woolly lavender. The plant is moving into its strongest growth phase and re-roots into fresh soil quickly. Avoid repotting in winter dormancy or, for flowering plants, while it is in bud or bloom — recovery is slowest then and you risk dropping the flowers.

Step-by-step: repotting woolly lavender

Time it for spring. Repot woolly lavender in early spring as growth restarts so it re-roots quickly into the fresh soil.
Choose one size up. Pick a pot about 2–3 cm wider with drainage holes. One step only — a much bigger pot stays soggy and rots roots.
Ease the plant out. Water lightly the day before, then tip woolly lavender out and gently loosen any roots circling the bottom of the rootball.
Repot at the same depth. Put a layer of fresh sharply drained, lean, alkaline soil, ph 7.0–8.5 in the new pot, set the plant so its soil line is unchanged, and backfill, firming lightly.
Water and pause feeding. Water once to settle the soil. Hold off fertiliser for about a month — fresh mix already has nutrients and feeding now burns new roots.

Aftercare

Because the new soil holds more water than the old crammed rootball did, ease right back on watering — let the top of the soil dry before you water woolly lavender again, or you will rot the roots in the very pot you just moved it to. Keep it out of harsh direct sun for a fortnight. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for woolly lavender

Woolly Lavender wants sharply drained, lean, alkaline soil, ph 7.0–8.5. Native to rocky limestone slopes; thrives in gravelly, infertile soil — avoid fertile or moisture-retentive composts that promote lush soft growth prone to disease. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting woolly lavender — frequently asked questions

How often should you repot woolly lavender?

Every 2–4 years — it is in no hurry for woolly lavender. Repot woolly lavender only every 2–4 years — it builds roots slowly and a yearly repot is wasted effort. Move up just one pot size in spring with fresh sharply drained, lean, alkaline soil, ph 7.0–8.5. The main error is repotting too often and into too large a pot, which leaves cold wet soil around the roots.

What size pot does woolly lavender need?

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

Can you put woolly lavender straight into a much bigger pot?

No. Even a fast-growing woolly lavender should only go up one pot size at a time. A vastly oversized pot holds a reservoir of wet soil the roots cannot reach, which stays cold and soggy and rots the roots — the opposite of what you wanted.

Should you fertilise woolly lavender after repotting?

Not immediately. Wait about 4 weeks after repotting woolly 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.