Hydrangea 'Incrediball' (Incrediball hydrangea) care

Light

In the wild hydrangea 'incrediball' grows on the bright edge of a forest canopy, not in the canopy and not in the open. Indoors, that translates to within a metre of an unobstructed window, sheer curtain optional. Part shade to full sun; ideally morning sun with afternoon shade. Tolerates more shade than panicle types but needs some sun for strong stems and abundant blooms. Deep shade reduces flowering. The fastest test: a hand held at the leaf casts a soft-edged shadow at noon — sharp shadow means too much sun, no shadow means too little light.

Watering

Aim for when the top 5 cm of soil is dry, about 2-3 times per week in summer for hydrangea 'incrediball', 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. Moisture-loving; keep evenly damp, especially in heat, as it wilts quickly when dry. Roughly 2.5 cm (1 inch) of water weekly, more in sun. Mulch heavily to hold moisture.

Soil and pot

Hydrangea 'Incrediball' grows best in moist, rich, well-drained loam. Fertile, organically rich soil that holds moisture but drains freely. Adaptable to most pH; bloom colour is unaffected by pH. Improve sandy or clay soils with compost. 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

Hydrangea 'Incrediball' sits happiest at around Ambient outdoor humidity and -40 to 30°C (-40 to 86°F). A hardy outdoor shrub with no humidity requirements beyond normal seasonal outdoor conditions in temperate gardens. 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 hydrangea 'incrediball' sparingly. One feed of balanced slow-release fertiliser in early spring is sufficient. Excess nitrogen still produces weaker stems despite the cultivar's strength, so feed moderately. 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 hydrangea 'incrediball' in the Growli community. Each is annotated with the most common cause so you know where to start.

• Wilting in heat — Smooth hydrangeas wilt dramatically when soil dries. Water deeply and mulch; plants usually recover overnight once rehydrated.
• Stem flop after rain — Even strong stems can bow under waterlogged giant blooms. Prune to about 30 cm (12 in) in late winter to encourage thicker, more upright new growth.
• Few blooms — Too much shade or autumn pruning removes flower potential. Give more sun and prune only in late winter/early spring.
• Leaf spot — Fungal spotting in wet, crowded conditions. Avoid overhead watering, space plants for airflow, and clear fallen debris.

Propagation

Easily propagated by softwood cuttings in early summer or by division of the clumping crown. Patented cultivar ('Abetwo') — propagation restricted to personal, non-commercial use. 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

Hydrangea 'Incrediball' is toxic to pets. ASPCA lists Hydrangea (including smooth hydrangea, sometimes called 'Hills of Snow') as toxic to dogs, cats, and horses. The toxic principle is cyanogenic glycoside; ingestion typically causes vomiting, depression, and diarrhoea. Significant cyanide toxicity is uncommon and usually presents as GI upset. 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.

Hydrangea 'Incrediball' deep-dive guides

Every aspect of hydrangea 'incrediball' care, each with its own calibrated guide:

• Hydrangea 'Incrediball' watering schedule
• Hydrangea 'Incrediball' light requirements
• Best soil mix for hydrangea 'incrediball'
• Hydrangea 'Incrediball' fertilizing guide
• When to repot hydrangea 'incrediball'
• How to propagate hydrangea 'incrediball'
• Hydrangea 'Incrediball' growth rate & size
• Hydrangea 'Incrediball' cold hardiness
• Hydrangea 'Incrediball' temperature & humidity
• Is hydrangea 'incrediball' toxic to cats & dogs?
• Is hydrangea 'incrediball' toxic to cats?
• Is hydrangea 'incrediball' toxic to dogs?
• Getting hydrangea 'incrediball' to bloom

Featured in these plant shortlists

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

• Best plants for a north-facing window — Houseplants for a north-facing window: bright, even, indirect light and no scorching direct sun. Each pick verified against its documented light needs.
• 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 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

Hydrangea 'Incrediball' is also commonly called Incrediball hydrangea or strong annabelle hydrangea.

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