Leucanthemum × superbum 'Wirral Supreme' (Wirral Supreme Shasta daisy) care

Light

Leucanthemum × superbum 'Wirral Supreme' needs sun on the leaves, not just bright ambient room light. Full sun, 6 hours or more daily, produces the best display and strongest stems. It tolerates light shade but flowers less freely and stems become weaker and more prone to flopping. 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 leucanthemum × superbum 'wirral supreme' when the top 2-3 cm of soil is dry, about weekly; more during drought. 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. Water regularly to establish, then keep evenly moist in dry spells for sustained flowering. It dislikes both drought stress and winter waterlogging, so steady moisture with good drainage is ideal.

Soil and pot

Leucanthemum × superbum 'Wirral Supreme' grows best in fertile, moist but well-drained soil. Grows in most reasonable garden soils with good drainage; it resents winter wet that rots the crown. Neutral pH and moderate fertility give sturdy growth without excessive softness. 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

Leucanthemum × superbum 'Wirral Supreme' sits happiest at around Ambient outdoor humidity humidity and -29-30°C (-20-86°F). An outdoor border perennial untroubled by air humidity. Adequate spacing and airflow help prevent fungal leaf spot and powdery mildew in damp summers. 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 leucanthemum × superbum 'wirral supreme' sparingly. Feed once in spring with a balanced general fertiliser as growth resumes; avoid heavy feeding, which makes the tall stems floppier still. A mulch of well-rotted compost also supplies steady nutrients. 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 leucanthemum × superbum 'wirral supreme' in the Growli community. Each is annotated with the most common cause so you know where to start.

• Flopping double heads — The heavy double flowers weigh stems down, especially after rain. Provide a grow-through support early in the season or grow among sturdier neighbours.
• Crown rot in wet ground — Cold, waterlogged soil rots the crown over winter. Ensure sharp drainage, keep mulch off the crown, and divide aging clumps to maintain vigour.
• Powdery mildew and leaf spot — Humid, crowded conditions encourage fungal foliage problems. Improve spacing and airflow, water at the base, and clear infected leaves.
• Centre die-out — Established clumps thin and die in the middle. Lift and divide every 2-3 years in spring or autumn to restore even, vigorous flowering.

Propagation

Divide clumps every 2-3 years in spring or early autumn, replanting vigorous outer portions. Spring basal cuttings root well. As a named double cultivar it must be propagated vegetatively to keep the double flower form 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

Leucanthemum × superbum 'Wirral Supreme' is toxic to pets. The ASPCA lists daisy (Chrysanthemum spp., Compositae) as toxic to dogs and cats, and Shasta daisy was formerly classified as Chrysanthemum × superbum within the same family. The toxic principles are sesquiterpene lactones, pyrethrins and other irritants; ingestion can cause vomiting, diarrhoea, hypersalivation, incoordination and dermatitis. 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.

Leucanthemum × superbum 'Wirral Supreme' deep-dive guides

Every aspect of leucanthemum × superbum 'wirral supreme' care, each with its own calibrated guide:

• Leucanthemum × superbum 'Wirral Supreme' watering schedule
• Leucanthemum × superbum 'Wirral Supreme' light requirements
• Best soil mix for leucanthemum × superbum 'wirral supreme'
• Leucanthemum × superbum 'Wirral Supreme' fertilizing guide
• When to repot leucanthemum × superbum 'wirral supreme'
• How to propagate leucanthemum × superbum 'wirral supreme'
• Leucanthemum × superbum 'Wirral Supreme' growth rate & size
• Leucanthemum × superbum 'Wirral Supreme' cold hardiness
• Leucanthemum × superbum 'Wirral Supreme' temperature & humidity
• Is leucanthemum × superbum 'wirral supreme' toxic to cats & dogs?
• Is leucanthemum × superbum 'wirral supreme' toxic to cats?
• Is leucanthemum × superbum 'wirral supreme' toxic to dogs?
• Getting leucanthemum × superbum 'wirral supreme' to bloom

Featured in these plant shortlists

Leucanthemum × superbum 'Wirral Supreme' qualifies for 5 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best drought-tolerant houseplants — Houseplants that prefer to dry out — forgiving of forgotten watering and ideal for travel or busy weeks.
• Best flowering houseplants — Indoor plants grown for their blooms — selected from the flowering species in Growli’s plant-care library.
• Houseplants toxic to cats & dogs — The common houseplants the ASPCA lists as toxic to cats and dogs — the ones to keep out of reach, each with its symptoms and a safe alternative.
• Best houseplants for full sun — Houseplants that want direct sun — the species for a hot south or west-facing windowsill where shade-lovers scorch.
• Best houseplants for a cool room — Houseplants that tolerate cool conditions down to about 10°C — for an unheated spare room, hallway, porch or a home kept cool.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Leucanthemum × superbum 'Wirral Supreme' is also commonly called Wirral Supreme Shasta daisy or double Shasta daisy.

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