Repotting guide

When & how to repot Sticky Santolina (Santolina viscosa)

Also called Sticky santolina, Sticky lavender cotton.

More about sticky santolina

About Sticky Santolina

Santolina viscosa · also called Sticky santolina, Sticky lavender cotton · herb

Santolina viscosa is a rare evergreen sub-shrub endemic to the gypsum and marly-gypsum scrublands of southeastern Spain, primarily in the provinces of Murcia and Almería, where it grows at altitudes up to 600 m. Its common name refers to its distinctly sticky, viscid stems and foliage — an unusual characteristic within the Santolina genus. Like its relatives it demands full sun and sharply drained, poor soils, and it is particularly adapted to gypsum substrates. It is seldom cultivated outside specialist Mediterranean plant collections. Santolina is not listed on the ASPCA database; treat as mildly toxic to pets based on its aromatic oil content.

Mature size: 0.2–0.4 m tall and 0.3–0.5 m wide.

Watch for — Root rot on non-gypsum soils: S. viscosa is specialised to gypsum substrates and can struggle in ordinary garden soils; mix in grit and chalk when planting or grow in a dedicated scree or alpine bed.

How to tell sticky santolina needs repotting

Repotting on a calendar is less reliable than reading the plant. For sticky 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 sticky santolina

Every 2–3 years, into bone-dry mix. Sticky Santolina's growth habit — low-growing, compact, mound-forming evergreen sub-shrub with noticeably sticky stems. — sets the pace. Santolina viscosa is a rare evergreen sub-shrub endemic to the gypsum and marly-gypsum scrublands of southeastern Spain, primarily in the provinces of Murcia and Almería, where it grows at altitudes up to 600 m. Its common name refers to its distinctly sticky, viscid stems and foliage — an unusual characteristic within the Santolina genus. Like its relatives it demands full sun and sharply drained, poor soils, and it is particularly adapted to gypsum substrates. It is seldom cultivated outside specialist Mediterranean plant collections. Santolina is not listed on the ASPCA database; treat as mildly toxic to pets based on its aromatic oil content.

What size pot to step sticky santolina up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Sticky 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 sticky santolina

Spring or summer, while sticky 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 sticky santolina

Repot dry. Do not water sticky 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 very poor, extremely well-drained; gypsum, marly-gypsum, or sandy substrates preferred 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 sticky 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 sticky 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 sticky santolina

Sticky Santolina wants very poor, extremely well-drained; gypsum, marly-gypsum, or sandy substrates preferred. Uniquely adapted to gypsum soils; in cultivation, the closest substitute is very gritty, low-nutrient, alkaline compost or a raised limestone scree bed. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting sticky santolina — frequently asked questions

How often should you repot sticky santolina?

Every 2–3 years, into bone-dry mix for sticky santolina. Repot sticky santolina every 2–3 years into a snug pot of very poor, extremely well-drained; gypsum, marly-gypsum, or sandy substrates preferred, 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 sticky santolina need?

When is the best time of year to repot sticky santolina?

Should you water sticky santolina after repotting?

No — not straight away. Repot sticky 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 sticky santolina after repotting?

Not immediately. Wait about 3 weeks after repotting sticky 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.