Repotting guide

When & how to repot Jagged Lavender (Lavandula pinnata)

Also called Jagged lavender, Fern leaf lavender, Pinnate lavender.

More about jagged lavender

About Jagged Lavender

Lavandula pinnata · also called Jagged lavender, Fern leaf lavender · tropical

A frost-tender lavender native to the Canary Islands and Madeira, grown for its striking, deeply pinnately lobed silver-grey leaves and airy spikes of pale violet-blue flowers produced over a long season. It thrives in dry, sunny conditions with sharply drained soil and is suitable for outdoor cultivation only in essentially frost-free climates; elsewhere it performs well as a container plant overwintered under glass. The delicate, feathery foliage distinguishes it immediately from other lavenders. Lavender is toxic to cats, dogs, and horses according to the ASPCA.

Mature size: 60–100 cm tall and 60–90 cm wide (24–40 in × 24–36 in).

Watch for — Frost damage and dieback: Even a brief frost below 0°C (32°F) blackens and kills soft growth; a hard frost kills the plant to the roots. Move containers under glass before the first autumn frost and maintain minimum 2–3°C overnight.

How to tell jagged lavender needs repotting

Repotting on a calendar is less reliable than reading the plant. For jagged 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 jagged lavender

Every 2–3 years, into bone-dry mix. Jagged Lavender's growth habit — open, upright evergreen subshrub with deeply pinnately divided, silver-grey aromatic leaves and slender, multi-branched flowering stems. — sets the pace. A frost-tender lavender native to the Canary Islands and Madeira, grown for its striking, deeply pinnately lobed silver-grey leaves and airy spikes of pale violet-blue flowers produced over a long season. It thrives in dry, sunny conditions with sharply drained soil and is suitable for outdoor cultivation only in essentially frost-free climates; elsewhere it performs well as a container plant overwintered under glass. The delicate, feathery foliage distinguishes it immediately from other lavenders. Lavender is toxic to cats, dogs, and horses according to the ASPCA.

What size pot to step jagged lavender up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Jagged 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 jagged lavender

Spring or summer, while jagged 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 jagged lavender

Repot dry. Do not water jagged 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 very free-draining, gritty or sandy loam, ph 6.5–8.0 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 jagged 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 jagged 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 jagged lavender

Jagged Lavender wants very free-draining, gritty or sandy loam, ph 6.5–8.0. Blend at least one-third coarse perlite or horticultural grit into potting compost; in the ground, plant on a raised bed or slope for guaranteed drainage. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting jagged lavender — frequently asked questions

How often should you repot jagged lavender?

Every 2–3 years, into bone-dry mix for jagged lavender. Repot jagged lavender every 2–3 years into a snug pot of very free-draining, gritty or sandy loam, ph 6.5–8.0, 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 jagged lavender need?

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

Should you water jagged lavender after repotting?

No — not straight away. Repot jagged 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 jagged lavender after repotting?

Not immediately. Wait about 3 weeks after repotting jagged 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.