Delphinium grandiflorum 'Blue Butterfly' (Blue Butterfly delphinium) care

Light

Delphinium grandiflorum 'Blue Butterfly' needs sun on the leaves, not just bright ambient room light. Full sun for the most intense blue and a compact, free-flowering habit; tolerates light shade. At least 6 hours of direct sun keeps the dwarf plant tidy and floriferous. 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 delphinium grandiflorum 'blue butterfly' every 4-7 days; keep soil moist but well-drained, avoiding extremes. 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. Less thirsty than the giant border types but still prefers steady moisture. Water at the base in dry spells; it tolerates lean conditions better than tall delphiniums but resents waterlogging.

Soil and pot

Delphinium grandiflorum 'Blue Butterfly' grows best in fertile, well-drained soil. Adaptable to loam, sand or gravelly soil at neutral to slightly alkaline pH 6.5-7.5. Sharp drainage is essential, as this short-lived species rots quickly in heavy, wet ground. 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

Delphinium grandiflorum 'Blue Butterfly' sits happiest at around Ambient outdoor humidity and -34 to 27°C (-29 to 81°F). An undemanding border and container perennial unconcerned with air humidity; good airflow helps keep the fine foliage free of mildew. 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 delphinium grandiflorum 'blue butterfly' sparingly. Lighter feeders than tall delphiniums. A balanced fertiliser in spring and a deadheading-time feed encourage repeat bloom; avoid overfeeding, which makes lax growth on this naturally compact plant. 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 delphinium grandiflorum 'blue butterfly' in the Growli community. Each is annotated with the most common cause so you know where to start.

• Short-lived plants — Often performs as a biennial or short-lived perennial. Deadhead to prolong bloom and resow regularly, or allow some self-seeding to maintain a stand.
• Slugs and snails — Tender new shoots and seedlings are vulnerable in spring. Protect emerging growth with barriers, traps or wildlife-safe controls.
• Powdery mildew — The fine foliage can grey over in dry, crowded or humid conditions. Space plants for airflow and water at the base rather than overhead.
• Crown rot in wet soil — Heavy, poorly drained ground rots this short-lived species fast. Plant in sharply drained soil or gritty container mix and avoid winter wet.

Propagation

Easily and quickly raised from seed, flowering the first year if sown early; it comes reasonably true and may self-seed. Sow in spring or autumn in free-draining compost. 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

Delphinium grandiflorum 'Blue Butterfly' is toxic to pets. ASPCA-listed as toxic to cats, dogs and horses (Delphinium species). The toxic principle is diterpene alkaloids; signs include salivation, colic, constipation, muscle tremors, stiffness, weakness and convulsions, with possible cardiac failure or fatal respiratory paralysis in large ingestions. Seeds and young growth are most potent. 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.

Delphinium grandiflorum 'Blue Butterfly' deep-dive guides

Every aspect of delphinium grandiflorum 'blue butterfly' care, each with its own calibrated guide:

• Delphinium grandiflorum 'Blue Butterfly' watering schedule
• Delphinium grandiflorum 'Blue Butterfly' light requirements
• Best soil mix for delphinium grandiflorum 'blue butterfly'
• Delphinium grandiflorum 'Blue Butterfly' fertilizing guide
• When to repot delphinium grandiflorum 'blue butterfly'
• How to propagate delphinium grandiflorum 'blue butterfly'
• Delphinium grandiflorum 'Blue Butterfly' growth rate & size
• Delphinium grandiflorum 'Blue Butterfly' cold hardiness
• Delphinium grandiflorum 'Blue Butterfly' temperature & humidity
• Is delphinium grandiflorum 'blue butterfly' toxic to cats & dogs?
• Is delphinium grandiflorum 'blue butterfly' toxic to cats?
• Is delphinium grandiflorum 'blue butterfly' toxic to dogs?
• Getting delphinium grandiflorum 'blue butterfly' to bloom

Featured in these plant shortlists

Delphinium grandiflorum 'Blue Butterfly' qualifies for 5 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• 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 small & tabletop houseplants — Compact houseplants that stay under about 40 cm — desk, shelf and windowsill plants that never outgrow a small space.
• 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

Delphinium grandiflorum 'Blue Butterfly' is also commonly called Blue Butterfly delphinium or Chinese delphinium.

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