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Plant care

Heather (Ling) care

Calluna vulgaris

Also called Heather, Ling, Scots Heather.

RHS H7USDA 4-7Pet-safeIndoor 20–60 cm tall

Watering rhythm

Direct sun (at least 4-6 hours)

Weekly during establishment; drought-tolerant once established

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Light

Direct sun (at least 4-6 hours)

Soil

Acidic, free-draining ericaceous soil (pH 4.5–6.0)

Humidity

40–70%

Temp

-20°C to 25°C

Pet safety

Pet-safe

Mature size

20–60 cm tall

Care at a glance

Light

Most houseplants will scorch where heather thrives. Give it the windowsill you'd otherwise leave empty because everything else burned there. Full sun is essential for dense, floriferous growth. At least 6 hours of direct sunlight daily encourages the best flower production and prevents straggly, open habit. Will tolerate partial shade but blooms noticeably less freely. A plant moved abruptly from low light to direct sun bleaches in 48 hours — always acclimatise over a week.

Watering

Aim for weekly during establishment; drought-tolerant once established for heather, but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Water regularly for the first season to establish roots. Once established, heather tolerates dry spells well but appreciates watering during prolonged summer drought. Avoid waterlogging, which causes root rot in heavy soils. Rainwater is preferable in hard-water areas, as tap water raises soil pH.

Soil and pot

Heather grows best in acidic, free-draining ericaceous soil (ph 4.5–6.0). Must have acidic, low-fertility soil — never alkaline or clay-heavy without significant amendment. Mix ericaceous compost with grit or sharp sand for container growing. On alkaline ground, raised beds of ericaceous mix are the only reliable option. Avoid fertiliser-rich composts which promote lush leafy growth at the expense of flowers. 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

Heather sits happiest at around 40–70% humidity and -20°C to 25°C (-4°F to 77°F). Naturally adapted to cool, moist moorland air. Tolerates ambient UK humidity well. In drier continental climates, mulching with pine bark helps retain soil moisture around the root zone without raising pH. 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 heather sparingly. Feed sparingly once a year in early spring with a specialist ericaceous fertiliser (e.g. sulphate of ammonia or proprietary azalea feed). Heavy feeding produces soft, weak growth. Container plants benefit from a half-strength liquid ericaceous feed monthly from April to August. 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 heather in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Soil pH too high (chlorosis) — Yellowing foliage with green veins indicates iron deficiency caused by alkaline soil. Apply sulphur dust to lower pH, switch to rainwater irrigation, and treat with sequestered iron chelate feed.
  • Leggy or open growth — Caused by insufficient light or failure to prune. Trim lightly immediately after flowering each year with shears, removing spent flower heads but never cutting back into bare old wood, which does not regenerate.
  • Phytophthora root rot — Sudden wilting and blackening of stems in wet, poorly drained conditions. Improve drainage, avoid overwatering, and do not replant heathers in the same spot. No effective chemical treatment once established.

Propagation

Take 3–5 cm semi-ripe cuttings in mid to late summer, insert into a mix of ericaceous compost and perlite, and cover with a plastic bag or propagator lid. Rooting occurs in 6–8 weeks at 15–18°C. Layering in spring (pegging down low stems into moist ericaceous compost) is also reliable. Seed is possible but extremely slow and cultivar traits will not come true. 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

Heather is pet-safe. Calluna vulgaris is not listed as toxic by the ASPCA and has no reported toxic principles to dogs or cats. It is widely grown in gardens accessible to pets without documented poisoning incidents. 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.

Heather care — frequently asked questions

What is the common name for Calluna vulgaris?

Calluna vulgaris is most commonly called Heather, but it is also known as Heather, Ling, Scots Heather. The names refer to the same species, so care instructions for Heather apply identically to anything sold as Ling.

How much light does heather need?

Heather grows best in direct sun (at least 4-6 hours). Full sun is essential for dense, floriferous growth. At least 6 hours of direct sunlight daily encourages the best flower production and prevents straggly, open habit. Will tolerate partial shade but blooms noticeably less freely.

How often should I water heather?

Water heather weekly during establishment; drought-tolerant once established. Water regularly for the first season to establish roots. Once established, heather tolerates dry spells well but appreciates watering during prolonged summer drought. Avoid waterlogging, which causes root rot in heavy soils. Rainwater is preferable in hard-water areas, as tap water raises soil pH. 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 heather toxic to cats and dogs?

Heather is pet-safe. Calluna vulgaris is not listed as toxic by the ASPCA and has no reported toxic principles to dogs or cats. It is widely grown in gardens accessible to pets without documented poisoning incidents.

What USDA hardiness zone does heather grow in?

Heather is rated for USDA zone 4-7 and RHS hardiness H7. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Heather deep-dive guides

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

Featured in these plant shortlists

Heather qualifies for 9 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Heather is also known as Heather, Ling, and Scots Heather.