Fertilising guide
How to fertilise Creeping Rosemary (Rosmarinus officinalis 'Prostratus')— schedule & NPK
Also called Creeping Rosemary, Trailing Rosemary, Prostrate Rosemary.
More about creeping rosemary
About Creeping Rosemary
Rosmarinus officinalis 'Prostratus' · also called Creeping Rosemary, Trailing Rosemary · herb
A low-growing, ground-hugging rosemary cultivar that spreads horizontally to form a fragrant, evergreen carpet or cascades dramatically over walls and retaining banks. Reaches only 30–60 cm tall but spreads 90–150 cm wide. Produces pale lavender-blue flowers in late winter through spring. Excellent for slopes, containers, and hanging baskets.
Growth habit: Prostrate, ground-hugging to cascading evergreen shrub with trailing, arching stems; very low-growing
What fertiliser creeping rosemary actually wants — and why
Creeping Rosemary is a lean, aromatic herb — the essential-oil flavour you grow it for is strongest in poor soil, so feeding it actively makes it worse.
Little or nothing. If anything, a very weak balanced feed or a thin compost top-dress — never a rich nitrogen feed, which dilutes the aromatic oils and produces soft, bland, floppy growth.
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 creeping rosemary: 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 creeping rosemary, 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 creeping rosemary:
Apply a light balanced granular fertiliser in spring only. 'Prostratus' is less hardy than upright rosemary and autumn feeding promotes frost-susceptible soft growth. Lean soil is preferred to maintain hardiness and aromatic oil content. In practice: a spring compost top-dress at most, and otherwise leave creeping rosemary unfed — lean, sharp-draining soil is exactly what concentrates its flavour.
The dormant-season rule matters more than the exact interval: skip feeding entirely when creeping rosemary 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 creeping rosemary
As weak as it gets for creeping rosemary, or none at all. The flavour-versus-growth trade-off runs the opposite way to leafy crops: restraint is the technique.
Feeding always goes onto already-damp soil, never dry roots — water creeping rosemary first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the creeping rosemary watering schedule.
Signs you are over-feeding creeping rosemary
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for creeping rosemary:
- Lush, soft, fast growth with noticeably weaker scent and flavour.
- Floppy stems, sparse essential oils, and poor cold/wet hardiness.
- Salt crust in containers and scorched leaf tips from over-feeding.
Signs you are under-feeding creeping rosemary
- Rare — these herbs thrive on lean soil.
- Only on truly exhausted soil: pale, thin, very slow growth.
- A short-lived, weak plant in a long-spent container.
If the symptoms point at watering, light or roots rather than nutrition, the full creeping rosemary care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Over-feeding is so unlikely with creeping rosemary that flushing is rarely needed; if a container has had feed, a single plain-water flush and a switch to a leaner, grittier mix resets it.
Organic vs synthetic feeds for creeping rosemary
Organic options
A thin spring mulch of garden compost or leaf-mould is the most these want. UK: a little garden compost; US: a light Espoma Garden-tone top-dress at most. Lean and gritty beats fed and rich every time.
Synthetic / liquid feeds
Generally none for creeping rosemary. At absolute most, a very dilute balanced feed once or twice in a container; in the ground, nothing — synthetic feeds work directly against the flavour.
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 creeping rosemary — frequently asked questions
What fertiliser does creeping rosemary need?
Little or nothing. If anything, a very weak balanced feed or a thin compost top-dress — never a rich nitrogen feed, which dilutes the aromatic oils and produces soft, bland, floppy growth. Creeping Rosemary is a lean, aromatic herb — the essential-oil flavour you grow it for is strongest in poor soil, so feeding it actively makes it worse.
How often should I feed creeping rosemary?
Apply a light balanced granular fertiliser in spring only. 'Prostratus' is less hardy than upright rosemary and autumn feeding promotes frost-susceptible soft growth. Lean soil is preferred to maintain hardiness and aromatic oil content. Apply a light balanced granular fertiliser in spring only. 'Prostratus' is less hardy than upright rosemary and autumn feeding promotes frost-susceptible soft growth. Lean soil is preferred to maintain hardiness and aromatic oil content. In practice: a spring compost top-dress at most, and otherwise leave creeping rosemary unfed — lean, sharp-draining soil is exactly what concentrates its flavour.
What strength of feed for creeping rosemary?
As weak as it gets for creeping rosemary, or none at all. The flavour-versus-growth trade-off runs the opposite way to leafy crops: restraint is the technique.
What does over-feeding creeping rosemary look like?
Lush, soft, fast growth with noticeably weaker scent and flavour. Floppy stems, sparse essential oils, and poor cold/wet hardiness. Salt crust in containers and scorched leaf tips from over-feeding. Feeding creeping rosemary like a leafy vegetable is the defining mistake — rich nitrogen gives you a big, soft, fast plant whose leaves are watery and bland, with weak winter-rot resistance.
Should I flush the soil of creeping rosemary?
Over-feeding is so unlikely with creeping rosemary that flushing is rarely needed; if a container has had feed, a single plain-water flush and a switch to a leaner, grittier mix resets it.
Keep reading
- Creeping Rosemary care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water creeping rosemary — 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 pelargonium 'lara starshine'
- How to fertilise pelargonium graveolens 'attar of roses'
- How to fertilise pelargonium graveolens 'grey lady plymouth'
- All 6887 fertilising guides in the Growli library