Fertilising guide
How to fertilise Sticky Santolina (Santolina viscosa)— schedule & NPK
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.
Growth habit: Low-growing, compact, mound-forming evergreen sub-shrub with noticeably sticky stems.
What fertiliser sticky santolina actually wants — and why
Sticky Santolina is a soft, fast leafy herb that you harvest hard — a modest balanced feed keeps tender growth coming without tipping it into bland or bolting.
A balanced general feed (even N-P-K) at modest strength — enough nitrogen to keep replacing the leaves you pick, but not so much that flavour thins or it bolts to seed.
For the language behind the three numbers on the bottle — what nitrogen, phosphorus and potassium each do — see the NPK ratio explained entry. The short version for sticky santolina: match the feed to the job the plant is doing right now, not to a generic “plant food” on the shelf.
How often to feed sticky santolina, and which months
Feeding only earns its keep while the plant is in active growth and can use the nutrients — pour feed into a dormant or low-light plant and it simply builds up as root-burning salt. For sticky santolina:
Do not feed; this species is adapted to extremely nutrient-poor gypsum soils and fertilising causes the soft growth that is most susceptible to rot. In practice: a balanced liquid feed every few weeks through the main growing and harvesting season (spring through early autumn), more often the harder you are picking it.
The dormant-season rule matters more than the exact interval: skip feeding entirely when sticky santolina is resting. For the wider context on indoor feeding rhythms across the seasons, the houseplant fertiliser schedule walks through the year month by month.
What strength to mix for sticky santolina
Half strength is a sensible default for sticky santolina — enough to fuel regrowth after cutting, gentle enough that the leaves stay aromatic rather than watery.
Feeding always goes onto already-damp soil, never dry roots — water sticky santolina first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the sticky santolina watering schedule.
Signs you are over-feeding sticky santolina
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for sticky santolina:
- Fast, soft, pale growth with diluted, less aromatic flavour.
- Early bolting (running to flower) and a bitter edge.
- Salt crust and scorched tips on container plants.
Signs you are under-feeding sticky santolina
- Pale, slow regrowth after cutting and small leaves.
- A tired, stalled plant that cannot keep up with harvesting.
- Yellowing older leaves in a long-spent pot.
If the symptoms point at watering, light or roots rather than nutrition, the full sticky santolina care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Pot-grown sticky santolina builds up feed salts quickly — water until it drains each time and flush the pot with plain water every few weeks, especially on a sunny windowsill.
Organic vs synthetic feeds for sticky santolina
Organic options
A diluted seaweed feed or worm-casting tea keeps soft growth coming without overdoing it. UK: dilute seaweed or Westland; US: Espoma Garden-tone or Neptune's Harvest. Gentle, hard to overdo, flavour-friendly.
Synthetic / liquid feeds
A balanced liquid feed at half strength through harvesting — UK: Phostrogen, Baby Bio or Westland; US: Miracle-Gro all-purpose at half strength. Fast regrowth; just do not overdo the nitrogen.
Brand names are examples, not endorsements, and UK and US ranges differ — check the label’s own NPK and dilution rate, since formulations change.
Fertilising sticky santolina — frequently asked questions
What fertiliser does sticky santolina need?
A balanced general feed (even N-P-K) at modest strength — enough nitrogen to keep replacing the leaves you pick, but not so much that flavour thins or it bolts to seed. Sticky Santolina is a soft, fast leafy herb that you harvest hard — a modest balanced feed keeps tender growth coming without tipping it into bland or bolting.
How often should I feed sticky santolina?
Do not feed; this species is adapted to extremely nutrient-poor gypsum soils and fertilising causes the soft growth that is most susceptible to rot. Do not feed; this species is adapted to extremely nutrient-poor gypsum soils and fertilising causes the soft growth that is most susceptible to rot. In practice: a balanced liquid feed every few weeks through the main growing and harvesting season (spring through early autumn), more often the harder you are picking it.
What strength of feed for sticky santolina?
Half strength is a sensible default for sticky santolina — enough to fuel regrowth after cutting, gentle enough that the leaves stay aromatic rather than watery.
What does over-feeding sticky santolina look like?
Fast, soft, pale growth with diluted, less aromatic flavour. Early bolting (running to flower) and a bitter edge. Salt crust and scorched tips on container plants. Over-feeding sticky santolina with strong nitrogen is the usual mistake — it grows fast and lush but the leaves turn bland and it bolts to flower sooner, ending the useful harvest early.
Should I flush the soil of sticky santolina?
Pot-grown sticky santolina builds up feed salts quickly — water until it drains each time and flush the pot with plain water every few weeks, especially on a sunny windowsill.
Keep reading
- Sticky Santolina care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water sticky santolina — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
- How to fertilise rough marshmallow
- How to fertilise russian comfrey
- How to fertilise tuberous comfrey
- All 10153 fertilising guides in the Growli library