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Plant care

Cornish Heath Mrs D.F. Maxwell (Cornish Heath) care

Erica vagans 'Mrs D.F. Maxwell'

Also called Cornish Heath, Wandering Heath.

RHS H6USDA 5-8Pet-safeIndoor 40–60 cm tall × 60–80 cm wide (16–24 in × 24–32 in).

Watering rhythm

Direct sun (at least 4-6 hours)

Water weekly during dry spells, especially in the first two years

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Light

Direct sun (at least 4-6 hours)

Soil

Well-drained, acidic to near-neutral soil; pH 5.0–6.5

Humidity

Low to moderate (outdoor ambient)

Temp

-15 to 28 °C

Pet safety

Pet-safe

Mature size

40–60 cm tall × 60–80 cm wide (16–24 in × 24–32 in).

Care at a glance

Light

Cornish Heath Mrs D.F. Maxwell needs sun on the leaves, not just bright ambient room light. Full sun is essential for the richest flower colour and a tight, compact habit; partial shade results in sparse flowering and an open, untidy form. 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 cornish heath mrs d.f. maxwell water weekly during dry spells, especially in the first two years. 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. Once established it is reasonably drought-tolerant for a heath; however, prolonged dry spells in summer will shorten flowering and stress the plant.

Soil and pot

Cornish Heath Mrs D.F. Maxwell grows best in well-drained, acidic to near-neutral soil; ph 5.0–6.5. Erica vagans is the most lime-tolerant of the popular heaths and will grow on soils approaching neutral pH, though it still prefers slightly acid, humus-rich, well-drained conditions. 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

Cornish Heath Mrs D.F. Maxwell sits happiest at around Low to moderate (outdoor ambient) humidity and -15 to 28 °C (5 to 82 °F). Tolerates the mild, moist Atlantic conditions of south-west England especially well; also succeeds in drier continental climates with adequate irrigation. 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 cornish heath mrs d.f. maxwell sparingly. Apply a slow-release ericaceous fertiliser in early spring; avoid high-nitrogen feeds which promote leafy growth at the expense of flowers. 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 cornish heath mrs d.f. maxwell in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Woody, leggy growth if unclipped — Without annual clipping after flowering, plants become bare and woody at the base within a few years; trim lightly with shears in early spring, never cutting back into old brown wood.
  • Powdery mildew — Can appear in dry, hot summers particularly in sheltered spots with poor air circulation; improve airflow and avoid overhead watering at night.
  • Vine weevil root damage — Grubs of vine weevil (Otiorhynchus sulcatus) attack roots, causing sudden wilting and collapse; treat with nematode biocontrol (Steinernema kraussei) in late summer or early autumn.

Propagation

Semi-ripe cuttings taken in late summer root readily in ericaceous compost with bottom heat; division of established clumps in spring is possible but cuttings give cleaner results. 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

Cornish Heath Mrs D.F. Maxwell is pet-safe. Erica species are not listed by the ASPCA as toxic to cats or dogs and are generally considered non-toxic; no significant toxic principle has been identified in this genus. 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.

Cornish Heath Mrs D.F. Maxwell care — frequently asked questions

What is the common name for Erica vagans 'Mrs D.F. Maxwell'?

Erica vagans 'Mrs D.F. Maxwell' is most commonly called Cornish Heath Mrs D.F. Maxwell, but it is also known as Cornish Heath, Wandering Heath. The names refer to the same species, so care instructions for Cornish Heath Mrs D.F. Maxwell apply identically to anything sold as Cornish Heath.

How much light does cornish heath mrs d.f. maxwell need?

Cornish Heath Mrs D.F. Maxwell grows best in direct sun (at least 4-6 hours). Full sun is essential for the richest flower colour and a tight, compact habit; partial shade results in sparse flowering and an open, untidy form.

How often should I water cornish heath mrs d.f. maxwell?

Water cornish heath mrs d.f. maxwell water weekly during dry spells, especially in the first two years. Once established it is reasonably drought-tolerant for a heath; however, prolonged dry spells in summer will shorten flowering and stress the plant. 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 cornish heath mrs d.f. maxwell toxic to cats and dogs?

Cornish Heath Mrs D.F. Maxwell is pet-safe. Erica species are not listed by the ASPCA as toxic to cats or dogs and are generally considered non-toxic; no significant toxic principle has been identified in this genus.

What USDA hardiness zone does cornish heath mrs d.f. maxwell grow in?

Cornish Heath Mrs D.F. Maxwell is rated for USDA zone 5-8 and RHS hardiness H6. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Cornish Heath Mrs D.F. Maxwell deep-dive guides

Every aspect of cornish heath mrs d.f. maxwell care, each with its own calibrated guide:

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Related guides

Cornish Heath Mrs D.F. Maxwell is also commonly called Cornish Heath or Wandering Heath.