Fertilising guide
How to fertilise Salal (Gaultheria shallon)— schedule & NPK
Also called Salal, Shallon, Oregon Wintergreen.
More about salal
About Salal
Gaultheria shallon · also called Salal, Shallon · flowering
Gaultheria shallon is a vigorous, spreading evergreen shrub native to the Pacific coast of North America, from Alaska to central California, where it forms dense groundcover in moist, shaded conifer forest. Clusters of pink-tinged, urn-shaped flowers in late spring are followed by edible dark blue-black berries with a mild, sweet flavour long used by Indigenous peoples. It spreads by underground rhizomes and is valued as a low-maintenance, deer-resistant shade plant. Gaultheria shallon is considered non-toxic to dogs and cats and does not appear on ASPCA toxic plant lists.
Growth habit: Spreading, suckering, densely-branched evergreen shrub forming broad clumps via rhizomes.
What fertiliser salal actually wants — and why
Salal is an acid-loving plant — it can only take up nutrients in acidic soil, so the feed itself matters less than using an ericaceous formula and never liming.
An ericaceous (acidic) fertiliser, formulated to keep the soil pH low and supply iron and trace elements in a form acid-loving roots can absorb. Ordinary feeds and any lime lock out iron and yellow the leaves.
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 salal: 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 salal, 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 salal:
Generally unfussy; a top-dressing of leaf mould in autumn is usually sufficient. Ericaceous fertiliser can be applied in spring if growth is poor. In practice: an ericaceous feed in spring as growth resumes, repeated through the main growing months; never apply lime, bonemeal or wood ash, which raise pH.
The dormant-season rule matters more than the exact interval: skip feeding entirely when salal 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 salal
Follow the ericaceous product's own rate — these are formulated for the plant, so the dilution on the label is right for salal. The variable that actually matters is pH, not concentration.
Feeding always goes onto already-damp soil, never dry roots — water salal first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the salal watering schedule.
Signs you are over-feeding salal
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for salal:
- Brown, scorched leaf margins from too strong or too frequent a dose.
- White salt crust on the soil surface.
- Soft, lush growth that fruits or flowers poorly.
Signs you are under-feeding salal
- Yellowing leaves with green veins (iron chlorosis from high pH).
- Weak growth, poor cropping and an overall pale, stressed look.
- Stunted new shoots in spring despite adequate water and light.
If the symptoms point at watering, light or roots rather than nutrition, the full salal care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush salal with rainwater (not hard tap water, which raises pH) if salts build up; better still, mulch with pine needles or composted bark and water with rainwater to hold the acidity.
Organic vs synthetic feeds for salal
Organic options
Composted pine bark, pine-needle mulch, used coffee grounds and an organic ericaceous feed gently maintain acidity. UK: Vitax or Westland Ericaceous; US: Espoma Holly-tone or Dr. Earth Acid Lovers. Slow, soil-improving, hard to overdo.
Synthetic / liquid feeds
A liquid or granular ericaceous feed — UK: Miracle-Gro Ericaceous, Vitax or Westland; US: Miracle-Gro Acid-Loving Plant Food or Espoma Holly-tone. Pair with rainwater and an acidic mulch for it to work.
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 salal — frequently asked questions
What fertiliser does salal need?
An ericaceous (acidic) fertiliser, formulated to keep the soil pH low and supply iron and trace elements in a form acid-loving roots can absorb. Ordinary feeds and any lime lock out iron and yellow the leaves. Salal is an acid-loving plant — it can only take up nutrients in acidic soil, so the feed itself matters less than using an ericaceous formula and never liming.
How often should I feed salal?
Generally unfussy; a top-dressing of leaf mould in autumn is usually sufficient. Ericaceous fertiliser can be applied in spring if growth is poor. Generally unfussy; a top-dressing of leaf mould in autumn is usually sufficient. Ericaceous fertiliser can be applied in spring if growth is poor. In practice: an ericaceous feed in spring as growth resumes, repeated through the main growing months; never apply lime, bonemeal or wood ash, which raise pH.
What strength of feed for salal?
Follow the ericaceous product's own rate — these are formulated for the plant, so the dilution on the label is right for salal. The variable that actually matters is pH, not concentration.
What does over-feeding salal look like?
Brown, scorched leaf margins from too strong or too frequent a dose. White salt crust on the soil surface. Soft, lush growth that fruits or flowers poorly. Feeding salal an ordinary fertiliser, or growing it in hard tap water / limey soil, is the defining mistake — it triggers lime-induced chlorosis (yellow leaves, green veins) no amount of feeding fixes until the pH comes down.
Should I flush the soil of salal?
Flush salal with rainwater (not hard tap water, which raises pH) if salts build up; better still, mulch with pine needles or composted bark and water with rainwater to hold the acidity.
Keep reading
- Salal care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water salal — 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 zinnia 'benary's giant'
- How to fertilise zinnia 'profusion'
- How to fertilise narrow-leaf zinnia
- All 10153 fertilising guides in the Growli library