Growli
Let's go

Plant care

Crowberry (Mossberry) care

Empetrum nigrum

Also called Crowberry, Black Crowberry, Mossberry, Curlew Berry.

RHS H7USDA 2-6Pet-safeIndoor 15–25 cm tall

Watering rhythm

Direct sun (at least 4-6 hours)

Moderate; more frequent in first year, drought-tolerant once established

Jump to schedule→Get smart reminders in the app

Light

Direct sun (at least 4-6 hours)

Soil

Acidic, peaty or sandy, free-draining

Humidity

Moderate to high

Temp

-40°C to 20°C

Pet safety

Pet-safe

Mature size

15–25 cm tall

Care at a glance

Light

Crowberry needs sun on the leaves, not just bright ambient room light. Needs full sun to perform well; at least 6 hours of direct sun per day promotes dense, compact growth and good fruit set. It tolerates high-altitude UV intensity and open, exposed positions. A south or west-facing windowsill in the northern hemisphere is the default; anywhere else, expect the plant to stretch and pale out within a season.

Watering

Outdoor crowberry crops want moderate; more frequent in first year, drought-tolerant once established. The single best habit is a finger-test before watering — push a finger 3-4 cm into the soil. Damp = wait a day; dust-dry = water deeply at the base of the plant. Water regularly during the establishment year to keep the root zone moist; once established it tolerates dry spells but performs best where rainfall is consistent. Avoid waterlogging, though it grows naturally on wet moorland where drainage is lateral.

Soil and pot

Crowberry grows best in acidic, peaty or sandy, free-draining. Requires a pH of 4.0–5.5. Use ericaceous compost mixed with coarse grit for container growing, or plant into existing peaty moorland soil. Avoid lime, chalk, or compost containing alkaline materials. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Crowberry sits happiest at around Moderate to high humidity and -40°C to 20°C (-40°F to 68°F). Naturally found in cool, moist, windswept environments; tolerates maritime humidity and exposed coastal conditions well. Does not require misting and copes with low indoor humidity if grown as a container specimen in a cool conservatory. If you keep the room above year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed crowberry sparingly. Do not fertilise; Empetrum nigrum is adapted to nutrient-poor soils and excess nitrogen causes rank, vulnerable growth that disrupts its natural habit. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on crowberry in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Root rot in poorly drained sites — Despite tolerating moorland moisture, standing water around the crown causes root rot; ensure lateral drainage exists and raise plants on a gritty mound if planting in heavy soils.
  • Chlorosis on alkaline soils — Yellowing of young foliage indicates an elevated soil pH; treat with sequestered iron and acidify the growing medium with sulphur chips or switch to ericaceous compost.

Propagation

Semi-ripe cuttings taken in mid to late summer root readily under mist or in a covered propagator; layering of prostrate stems is also reliable. Seed germinates after cold stratification (8–12 weeks at 4°C) but growth is slow. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Crowberry is pet-safe. Empetrum nigrum is not listed as toxic by the ASPCA and the berries are consumed by wildlife and humans alike; no significant toxic compounds have been identified in the fruit or foliage. Considered non-toxic to cats and dogs. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Crowberry care — frequently asked questions

What is the common name for Empetrum nigrum?

Empetrum nigrum is most commonly called Crowberry, but it is also known as Crowberry, Black Crowberry, Mossberry, Curlew Berry. The names refer to the same species, so care instructions for Crowberry apply identically to anything sold as Mossberry.

How much light does crowberry need?

Crowberry grows best in direct sun (at least 4-6 hours). Needs full sun to perform well; at least 6 hours of direct sun per day promotes dense, compact growth and good fruit set. It tolerates high-altitude UV intensity and open, exposed positions.

How often should I water crowberry?

Water crowberry moderate; more frequent in first year, drought-tolerant once established. Water regularly during the establishment year to keep the root zone moist; once established it tolerates dry spells but performs best where rainfall is consistent. Avoid waterlogging, though it grows naturally on wet moorland where drainage is lateral. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is crowberry toxic to cats and dogs?

Crowberry is pet-safe. Empetrum nigrum is not listed as toxic by the ASPCA and the berries are consumed by wildlife and humans alike; no significant toxic compounds have been identified in the fruit or foliage. Considered non-toxic to cats and dogs.

What USDA hardiness zone does crowberry grow in?

Crowberry is rated for USDA zone 2-6 and RHS hardiness H7. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Crowberry deep-dive guides

Every aspect of crowberry care, each with its own calibrated guide:

Featured in these plant shortlists

Crowberry qualifies for 1 curated Growli shortlist — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Crowberry is also known as Crowberry, Black Crowberry, Mossberry, and Curlew Berry.