Fertilising guide
How to fertilise Cloudberry (Rubus chamaemorus)— schedule & NPK
Also called cloudberry, bakeapple, yellow berry.
More about cloudberry
About Cloudberry
Rubus chamaemorus · also called cloudberry, bakeapple · edible
Cloudberry is a low, creeping Arctic and sub-Arctic perennial of peat bogs and tundra, spreading by rhizomes rather than canes. Dioecious plants bear single white flowers and prized amber, raspberry-like berries with a tart, honeyed flavour. Demanding to cultivate, it needs cold summers and acidic, permanently moist peat, and both male and female plants for fruit.
Growth habit: Low, herbaceous, rhizomatous perennial creeping by underground stems to form colonies; dioecious, so male and female plants are needed together for berries.
Watch for — Difficult to establish in gardens: It demands exacting acidic, permanently moist peat-bog conditions and cool summers. Most cultivation failures stem from soil that is too fertile, too alkaline or too dry.
What fertiliser cloudberry actually wants — and why
Cloudberry 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 cloudberry: 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 cloudberry, 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 cloudberry:
Adapted to nutrient-poor bog conditions, so feed very sparingly if at all. Excess nutrients, lime or salts damage it; if needed, use only a dilute ericaceous (acid-loving) feed. Topping up with fresh sphagnum is usually preferable to fertiliser. 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 cloudberry 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 cloudberry
Follow the ericaceous product's own rate — these are formulated for the plant, so the dilution on the label is right for cloudberry. The variable that actually matters is pH, not concentration.
Feeding always goes onto already-damp soil, never dry roots — water cloudberry first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the cloudberry watering schedule.
Signs you are over-feeding cloudberry
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for cloudberry:
- 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 cloudberry
- 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 cloudberry care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush cloudberry 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 cloudberry
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 cloudberry — frequently asked questions
What fertiliser does cloudberry 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. Cloudberry 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 cloudberry?
Adapted to nutrient-poor bog conditions, so feed very sparingly if at all. Excess nutrients, lime or salts damage it; if needed, use only a dilute ericaceous (acid-loving) feed. Topping up with fresh sphagnum is usually preferable to fertiliser. Adapted to nutrient-poor bog conditions, so feed very sparingly if at all. Excess nutrients, lime or salts damage it; if needed, use only a dilute ericaceous (acid-loving) feed. Topping up with fresh sphagnum is usually preferable to fertiliser. 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 cloudberry?
Follow the ericaceous product's own rate — these are formulated for the plant, so the dilution on the label is right for cloudberry. The variable that actually matters is pH, not concentration.
What does over-feeding cloudberry 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 cloudberry 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 cloudberry?
Flush cloudberry 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
- Cloudberry care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water cloudberry — 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 tomato
- How to fertilise pepper
- How to fertilise cucumber
- All 5561 fertilising guides in the Growli library