Fertilising guide
How to fertilise Yellow Mountain Heath (Phyllodoce glanduliflora)— schedule & NPK
Also called Yellow Mountain Heath, Yellow Mountain Heather, Glandular-flowered Mountain Heath.
More about yellow mountain heath
About Yellow Mountain Heath
Phyllodoce glanduliflora · also called Yellow Mountain Heath, Yellow Mountain Heather · flowering
Phyllodoce glanduliflora is a low-growing evergreen subshrub native to alpine and subalpine zones of western North America from Oregon and Wyoming northward to Alaska, distinguished by its pale yellowish-white, glandular-hairy urn-shaped flowers in late spring and early summer. It naturally occurs above 1,500 m on moist, rocky or sandy slopes with peaty soils and requires cool summers, high humidity, and consistently moist acidic conditions. This is one of the most challenging Phyllodoce species to grow at lower elevations due to its requirement for cool temperatures year-round. Toxicity to pets has not been confirmed by ASPCA; as an Ericaceae member, treat with caution.
Growth habit: Low mat-forming evergreen subshrub with narrow, gland-tipped leaves densely arranged along the stems.
What fertiliser yellow mountain heath actually wants — and why
Yellow Mountain Heath 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 yellow mountain heath: 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 yellow mountain heath, 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 yellow mountain heath:
Apply a single very dilute ericaceous liquid fertiliser in early spring; avoid over-feeding, which causes soft growth unsuited to alpine conditions. 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 yellow mountain heath 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 yellow mountain heath
Follow the ericaceous product's own rate — these are formulated for the plant, so the dilution on the label is right for yellow mountain heath. The variable that actually matters is pH, not concentration.
Feeding always goes onto already-damp soil, never dry roots — water yellow mountain heath first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the yellow mountain heath watering schedule.
Signs you are over-feeding yellow mountain heath
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for yellow mountain heath:
- 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 yellow mountain heath
- 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 yellow mountain heath care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush yellow mountain heath 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 yellow mountain heath
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 yellow mountain heath — frequently asked questions
What fertiliser does yellow mountain heath 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. Yellow Mountain Heath 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 yellow mountain heath?
Apply a single very dilute ericaceous liquid fertiliser in early spring; avoid over-feeding, which causes soft growth unsuited to alpine conditions. Apply a single very dilute ericaceous liquid fertiliser in early spring; avoid over-feeding, which causes soft growth unsuited to alpine conditions. 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 yellow mountain heath?
Follow the ericaceous product's own rate — these are formulated for the plant, so the dilution on the label is right for yellow mountain heath. The variable that actually matters is pH, not concentration.
What does over-feeding yellow mountain heath 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 yellow mountain heath 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 yellow mountain heath?
Flush yellow mountain heath 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
- Yellow Mountain Heath care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water yellow mountain heath — 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 red ray switchgrass
- How to fertilise frosted curls sedge
- How to fertilise weeping brown sedge
- All 10153 fertilising guides in the Growli library