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Plant care

Cheddar Pink (Grenada Pink) care

Dianthus gratianopolitanus

Also called Cheddar Pink, Grenada Pink.

RHS H7USDA 3-9Mildly toxic to petsIndoor 10–15 cm tall in flower (4–6 in)

Watering rhythm

1-2weeks

Sparingly — every 1–2 weeks in summer

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Light

Direct sun (at least 4-6 hours)

Soil

Sharply drained, alkaline to neutral, low fertility

Humidity

Low, 30–50%

Temp

-20 to 28°C

Pet safety

Mildly toxic to pets

Mature size

10–15 cm tall in flower (4–6 in)

Care at a glance

Light

Cheddar Pink needs sun on the leaves, not just bright ambient room light. Requires full sun for at least 6 hours daily to produce the dense, compact cushion habit and maximum flower output; in partial shade plants become open and sprawling with fewer flowers. 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

Water cheddar pink sparingly — every 1–2 weeks in summer. The actual day count varies with pot size, light, and season — the finger test (or lifting the pot to feel its weight) is more reliable than a fixed calendar. Empty any drainage saucer afterwards so the pot isn't sitting in water. Extremely drought-tolerant; water only when the soil is completely dry, and never allow water to pool around the crown — crown rot in wet winters is the primary cause of plant loss.

Soil and pot

Cheddar Pink grows best in sharply drained, alkaline to neutral, low fertility. Thrives in gritty, limey or sandy soil with pH 6.5–8.0; incorporate up to 50% horticultural grit when planting in borders, and top-dress with a layer of gravel around the crown to prevent moisture contact. 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

Cheddar Pink sits happiest at around Low, 30–50% humidity and -20 to 28°C (-4 to 82°F). Adapted to the dry, exposed microclimate of limestone cliff-faces; dislikes humid, stagnant air — space plants at least 20 cm apart and avoid overhanging vegetation. 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 cheddar pink sparingly. Apply a light dressing of low-nitrogen, high-potash fertiliser (e.g. tomato food at quarter strength) once in early spring to promote flowering without promoting soft, disease-prone growth. 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 cheddar pink in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Crown rot in wet winters — Wet, poorly drained soil in winter is the single greatest killer; plant on a slope or in a raised bed, top-dress with coarse grit, and remove dead foliage from the crown in autumn.
  • Tortrix moth caterpillars — Small green caterpillars of Tortrix moths web leaves together and feed inside the rolled foliage, causing dieback of the mat; remove by hand or treat with Bacillus thuringiensis.
  • Centre die-back ('opening up') — Mature cushions can die in the centre after 4–5 years; pull apart the mat, discard woody sections, and replant healthy outer growth as unrooted cuttings in late summer.

Propagation

Propagate by stem cuttings 5–8 cm long taken immediately after flowering (June–July), rooted in a 50/50 mix of perlite and coarse grit in a cool cold frame. Also by layering — pin a stem to the soil surface, cover lightly with grit, and sever when rooted. Seed is possible but cultivated forms may 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

Cheddar Pink is mildly toxic to pets. The ASPCA lists Dianthus species as mildly toxic to dogs, cats, and horses. Saponins and other glycosides in the foliage and flowers can cause gastrointestinal signs (drooling, vomiting, diarrhoea) and mild dermatitis on contact. Serious toxicity is unlikely from incidental ingestion but veterinary advice should be sought if a pet consumes a significant amount. 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.

Cheddar Pink care — frequently asked questions

What is the common name for Dianthus gratianopolitanus?

Dianthus gratianopolitanus is most commonly called Cheddar Pink, but it is also known as Cheddar Pink, Grenada Pink. The names refer to the same species, so care instructions for Cheddar Pink apply identically to anything sold as Grenada Pink.

How much light does cheddar pink need?

Cheddar Pink grows best in direct sun (at least 4-6 hours). Requires full sun for at least 6 hours daily to produce the dense, compact cushion habit and maximum flower output; in partial shade plants become open and sprawling with fewer flowers.

How often should I water cheddar pink?

Water cheddar pink sparingly — every 1–2 weeks in summer. Extremely drought-tolerant; water only when the soil is completely dry, and never allow water to pool around the crown — crown rot in wet winters is the primary cause of plant loss. 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 cheddar pink toxic to cats and dogs?

Cheddar Pink is mildly toxic to pets. The ASPCA lists Dianthus species as mildly toxic to dogs, cats, and horses. Saponins and other glycosides in the foliage and flowers can cause gastrointestinal signs (drooling, vomiting, diarrhoea) and mild dermatitis on contact. Serious toxicity is unlikely from incidental ingestion but veterinary advice should be sought if a pet consumes a significant amount.

What USDA hardiness zone does cheddar pink grow in?

Cheddar Pink is rated for USDA zone 3-9 and RHS hardiness H7. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Cheddar Pink deep-dive guides

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

Featured in these plant shortlists

Cheddar Pink qualifies for 4 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Cheddar Pink is also commonly called Cheddar Pink or Grenada Pink.