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Plant care

Grey Speedwell (Gray Speedwell) care

Veronica cinerea

Also called Grey Speedwell, Gray Speedwell.

RHS H7USDA 4–9Pet-safeIndoor 5–10 cm tall

Watering rhythm

14-21days

Every 14–21 days during growing season; barely any in winter

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Light

Direct sun (at least 4-6 hours)

Soil

Very gritty, free-draining alkaline or neutral soil

Humidity

Low, 20–40%

Temp

-20 to 30°C

Pet safety

Pet-safe

Mature size

5–10 cm tall

Care at a glance

Light

Most houseplants will scorch where grey speedwell thrives. Give it the windowsill you'd otherwise leave empty because everything else burned there. Needs full sun — minimum 6 hours of direct sunlight per day. The silver leaf coating (tomentum) reflects heat and is an adaptation to intense sunlight; shade reduces flowering and causes the foliage to lose its silvery character. A plant moved abruptly from low light to direct sun bleaches in 48 hours — always acclimatise over a week.

Watering

Aim for every 14–21 days during growing season; barely any in winter for grey speedwell, 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. Highly drought-tolerant. Water sparingly during establishment, then only during prolonged dry spells. Overwatering or poor drainage will kill the plant; it is intolerant of wet roots.

Soil and pot

Grey Speedwell grows best in very gritty, free-draining alkaline or neutral soil. Best in a lean, mineral mix: 60% coarse grit or horticultural sand blended with loam. pH 6.5–8.0. Fertility should be low — rich soil produces weak, floppy growth. 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

Grey Speedwell sits happiest at around Low, 20–40% humidity and -20 to 30°C (-4 to 86°F). Native to semi-arid montane habitats; low ambient humidity is ideal. The silvery tomentum provides some protection against humidity fluctuations but the plant dislikes damp, still air. 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 grey speedwell sparingly. Little to no feeding required. A very light top-dressing of balanced slow-release granules (10-10-10) in early spring is sufficient. Avoid nitrogen-rich feeds. 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 grey speedwell in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Root rot in wet soils — The single most common cause of death. Plant in raised beds or on slopes; mix at least 50% coarse grit into the planting hole to ensure rapid drainage.
  • Loss of silver foliage colour — Indicates too much shade or over-fertilisation. Reposition in full sun and reduce feeding; the tomentum recovers as new growth emerges.
  • Aphid infestations in spring — Young shoots can be attacked by aphids. Treat with a strong water jet or insecticidal soap; natural predators usually control populations without intervention.

Propagation

Take 3–4 cm semi-ripe stem cuttings in early to mid-summer. Insert in a 50:50 perlite/sand mix and keep barely moist in a cool, bright spot. Division of clumps in early spring also works well. 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

Grey Speedwell is pet-safe. Veronica cinerea is not individually listed by the ASPCA, but the Veronica genus has no documented toxic principle for cats or dogs and is not associated with toxicity reports. 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.

Grey Speedwell care — frequently asked questions

What is the common name for Veronica cinerea?

Veronica cinerea is most commonly called Grey Speedwell, but it is also known as Grey Speedwell, Gray Speedwell. The names refer to the same species, so care instructions for Grey Speedwell apply identically to anything sold as Gray Speedwell.

How much light does grey speedwell need?

Grey Speedwell grows best in direct sun (at least 4-6 hours). Needs full sun — minimum 6 hours of direct sunlight per day. The silver leaf coating (tomentum) reflects heat and is an adaptation to intense sunlight; shade reduces flowering and causes the foliage to lose its silvery character.

How often should I water grey speedwell?

Water grey speedwell every 14–21 days during growing season; barely any in winter. Highly drought-tolerant. Water sparingly during establishment, then only during prolonged dry spells. Overwatering or poor drainage will kill the plant; it is intolerant of wet roots. 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 grey speedwell toxic to cats and dogs?

Grey Speedwell is pet-safe. Veronica cinerea is not individually listed by the ASPCA, but the Veronica genus has no documented toxic principle for cats or dogs and is not associated with toxicity reports.

What USDA hardiness zone does grey speedwell grow in?

Grey Speedwell is rated for USDA zone 4–9 and RHS hardiness H7. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Grey Speedwell deep-dive guides

Every aspect of grey speedwell care, each with its own calibrated guide:

Featured in these plant shortlists

Grey Speedwell qualifies for 12 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Grey Speedwell is also commonly called Grey Speedwell or Gray Speedwell.