Heuchera 'Key Lime Pie' (Coral Bells 'Key Lime Pie') care

Light

The Goldilocks zone. Not the south-facing windowsill (too hot, too direct), not the back of the room (too dim, growth stalls). Partial shade is ideal — morning sun and afternoon shade bring out the brightest chartreuse tones. Full shade causes the colour to fade to plain green. Avoid midday summer sun, which scorches the soft foliage. If you can't decide, a free phone lux-meter app aimed at the leaf at noon should read between 800 and 1,500 lux.

Watering

Watering heuchera 'key lime pie': when the top 2-3 cm of soil is dry, roughly every 7-10 days in the growing season. The number that matters isn't the day of the week — it's how dry the top 2-3 cm of the pot feels. A finger in the soil tells you more than a watering app. After every watering, tip the saucer. Water at the base to keep the crown dry. Once established, this cultivar handles short dry periods but consistent moisture produces the best growth. Reduce watering in winter; the plant semi-rests but remains evergreen in mild climates.

Soil and pot

Heuchera 'Key Lime Pie' grows best in humus-rich, well-draining loam or enriched garden soil. Mix in compost or leaf mould at planting to support healthy root development. Good drainage is essential — standing water at the crown will rot the plant. Aim for a slightly acidic to neutral pH of 6.0-7.0. 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

Heuchera 'Key Lime Pie' sits happiest at around 40-60% humidity and 5-25°C (41-77°F). Average ambient humidity is sufficient. Space plants to allow airflow; crowded, humid conditions encourage botrytis grey mould, especially in cool, wet springs. If you keep the room above 5 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 heuchera 'key lime pie' sparingly. Apply a balanced slow-release fertiliser (such as 10-10-10) at the start of the growing season in spring. A diluted liquid tomato feed applied once in early summer can enhance flower production. Avoid excessive nitrogen, which softens growth and reduces disease resistance. 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 heuchera 'key lime pie' in the Growli community. Each is annotated with the most common cause so you know where to start.

• Crown rot — The main killer of Heucheras; always plant with the crown at or just above soil level and ensure drainage is excellent.
• Vine weevil — Adult weevils notch leaf margins while larvae destroy roots; treat soil with entomopathogenic nematodes in late summer.
• Powdery mildew — White surface growth appears in warm, humid weather with poor air circulation; improve spacing and apply a diluted bicarbonate spray early.
• Foliar nematodes — Water-soaked then brown angular patches on leaves; remove affected foliage promptly and avoid overhead watering.
• Winter heaving — Repeated freezing and thawing can lift the shallow crown; firm back down after frost and apply a light gravel or bark mulch around the base.

Companion plants

Heuchera 'Key Lime Pie' pairs well with Hosta 'Halcyon', Ajuga reptans, Ferns, and Astilbe. These are species with similar light and water needs, so you can group them in the same room or on the same shelf and water as a batch.

Propagation

Divide clumps in spring or early autumn every 3-4 years to rejuvenate. Each division should have a firm crown section with attached roots. Leaf cuttings with a small piece of stem can root in a sand-peat mix under a propagation dome, though division is faster and truer-to-type. 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

Heuchera 'Key Lime Pie' is pet-safe. Heuchera is listed by the ASPCA as non-toxic to dogs, cats, and horses. No compounds harmful to pets have been identified in this genus under normal conditions. 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.

Heuchera 'Key Lime Pie' deep-dive guides

Every aspect of heuchera 'key lime pie' care, each with its own calibrated guide:

• Common heuchera 'key lime pie' problems & fixes
• Heuchera 'Key Lime Pie' watering schedule
• Heuchera 'Key Lime Pie' light requirements
• Best soil mix for heuchera 'key lime pie'
• Heuchera 'Key Lime Pie' fertilizing guide
• When to repot heuchera 'key lime pie'
• How to propagate heuchera 'key lime pie'
• How to prune heuchera 'key lime pie'
• What's eating my heuchera 'key lime pie'?
• Heuchera 'Key Lime Pie' growth rate & size
• Heuchera 'Key Lime Pie' cold hardiness
• Heuchera 'Key Lime Pie' temperature & humidity
• Is heuchera 'key lime pie' toxic to cats & dogs?
• Is heuchera 'key lime pie' toxic to cats?
• Is heuchera 'key lime pie' toxic to dogs?
• All 56 Heuchera varieties
• Getting heuchera 'key lime pie' to bloom

Featured in these plant shortlists

Heuchera 'Key Lime Pie' qualifies for 11 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best pet-safe houseplants — Houseplants the ASPCA lists as non-toxic to cats and dogs — every one verified against the ASPCA toxic and non-toxic plant list.
• Best low-light houseplants — Houseplants that need no direct sun and cope with a north-facing room or a spot well back from a window.
• 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 pet-safe low-light plants — Non-toxic to cats and dogs AND happy with no direct sun — the two hardest constraints to satisfy at once.
• Best plants for cold, dark rooms — Houseplants that cope with BOTH low light and a cool, unheated room — the hardest indoor spot to fill. Every pick tolerates a low of about 10°C and shade.
• Best flowering houseplants — Indoor plants grown for their blooms — selected from the flowering species in Growli’s plant-care library.
• Best pet-safe flowering plants — Flowering houseplants the ASPCA lists as non-toxic to cats and dogs — colour and blooms in a pet home, without the worry.
• 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.
• Best pet-safe bedroom plants — Non-toxic to cats and dogs and happy in lower light — calming greenery for a bedroom where a pet often sleeps too.
• Best cat-safe plants — Houseplants the ASPCA lists as non-toxic to cats (and dogs) — safe greenery for a home with a curious cat.
• Best dog-safe plants — Houseplants the ASPCA lists as non-toxic to dogs (and cats) — safe greenery for a home with a curious dog.
• Browse all 30 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Heuchera 'Key Lime Pie' is also commonly called Coral Bells 'Key Lime Pie' or Alumroot 'Key Lime Pie'.

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