Repotting guide

When & how to repot Comb-Leaved Santolina (Santolina pectinata)

Also called Comb-leaved santolina, Comb cotton lavender.

More about comb-leaved santolina

About Comb-Leaved Santolina

Santolina pectinata · also called Comb-leaved santolina, Comb cotton lavender · herb

Santolina pectinata is a compact, aromatic evergreen subshrub native to the Iberian Peninsula, Morocco, and Algeria, where it grows on dry, rocky hillsides and open scrubland. It bears finely divided, grey-green, comb-like leaves that release a pungent, camphor-tinged scent when brushed, and produces small, bright yellow button flowers in midsummer. The single most important care point is exceptional drainage — wet soil in winter is almost always fatal. ASPCA does not list Santolina pectinata specifically as non-toxic; treat as mildly toxic and keep pets from ingesting it.

Mature size: 30-45 cm tall by 45-60 cm wide (12-18 in × 18-24 in).

Watch for — Root rot: The most common cause of death; occurs when plants sit in waterlogged or poorly drained soil, particularly over winter. Improve drainage radically — add grit, raise the bed, or grow in containers with drainage holes — rather than reducing watering alone.

How to tell comb-leaved santolina needs repotting

Repotting on a calendar is less reliable than reading the plant. For comb-leaved santolina, 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 comb-leaved santolina

Every 2–3 years, into bone-dry mix. Comb-Leaved Santolina's growth habit — mounding, dwarf evergreen subshrub with a spreading, dome-shaped habit. — sets the pace. Santolina pectinata is a compact, aromatic evergreen subshrub native to the Iberian Peninsula, Morocco, and Algeria, where it grows on dry, rocky hillsides and open scrubland. It bears finely divided, grey-green, comb-like leaves that release a pungent, camphor-tinged scent when brushed, and produces small, bright yellow button flowers in midsummer. The single most important care point is exceptional drainage — wet soil in winter is almost always fatal. ASPCA does not list Santolina pectinata specifically as non-toxic; treat as mildly toxic and keep pets from ingesting it.

What size pot to step comb-leaved santolina up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Comb-Leaved Santolina 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 comb-leaved santolina

Spring or summer, while comb-leaved santolina 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 comb-leaved santolina

Repot dry. Do not water comb-leaved santolina 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 sandy or gritty, free-draining 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 comb-leaved santolina 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 comb-leaved santolina 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 comb-leaved santolina

Comb-Leaved Santolina wants sandy or gritty, free-draining. Thrives in poor to moderately fertile, alkaline to neutral soil with excellent drainage; rich, moisture-retentive soils promote rank growth and increase the risk of root rot. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting comb-leaved santolina — frequently asked questions

How often should you repot comb-leaved santolina?

Every 2–3 years, into bone-dry mix for comb-leaved santolina. Repot comb-leaved santolina every 2–3 years into a snug pot of sandy or gritty, free-draining, 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 comb-leaved santolina need?

When is the best time of year to repot comb-leaved santolina?

Should you water comb-leaved santolina after repotting?

No — not straight away. Repot comb-leaved santolina 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 comb-leaved santolina after repotting?

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