Repotting guide

When & how to repot Grosso Lavender (Lavandula × intermedia 'Grosso')

Also called Lavandin.

More about grosso lavender

About Grosso Lavender

Lavandula × intermedia 'Grosso' · also called Lavandin · herb

'Grosso' is the world's most widely grown lavandin, a sterile English-x-Portuguese hybrid bred for high oil yield and long, fragrant violet wands. It is larger, more vigorous, and more disease-resistant than English lavender, blooming in mid-to-late summer. It demands full sun and sharp drainage and dislikes humidity and rich, wet soil.

Mature size: 75-90 cm tall and up to 90-120 cm wide in flower

Watch for — Root rot and winter wet: Heavy or soggy soil rots the crown. Plant on a slope or raised gritty bed and avoid irrigation in cold, damp months.

How to tell grosso lavender needs repotting

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

Every 2–3 years, into bone-dry mix. Grosso Lavender's growth habit — large, vigorous, rounded evergreen subshrub with silvery foliage and very long flower stalks held well above the mound; woody at the base over time. — sets the pace. 'Grosso' is the world's most widely grown lavandin, a sterile English-x-Portuguese hybrid bred for high oil yield and long, fragrant violet wands. It is larger, more vigorous, and more disease-resistant than English lavender, blooming in mid-to-late summer. It demands full sun and sharp drainage and dislikes humidity and rich, wet soil.

What size pot to step grosso lavender up to

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

Spring or summer, while grosso 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 grosso lavender

Repot dry. Do not water grosso 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 free-draining gritty, neutral-to-alkaline loam 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 grosso 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 grosso 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 grosso lavender

Grosso Lavender wants free-draining gritty, neutral-to-alkaline loam. Lean soil with excellent drainage; add grit, sand, or gravel. Tolerates chalk well. Avoid moisture-retentive composts and heavy clay without amendment. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting grosso lavender — frequently asked questions

How often should you repot grosso lavender?

Every 2–3 years, into bone-dry mix for grosso lavender. Repot grosso lavender every 2–3 years into a snug pot of free-draining gritty, neutral-to-alkaline loam, 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 grosso lavender need?

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

Should you water grosso lavender after repotting?

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

Not immediately. Wait about 3 weeks after repotting grosso 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.