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Plant care

Stoneham Gold Western Red Cedar (Stoneham Gold Giant Arborvitae) care

Thuja plicata 'Stoneham Gold'

Also called Stoneham Gold Western Red Cedar, Stoneham Gold Giant Arborvitae, Western Redcedar 'Stoneham Gold'.

RHS H7USDA 5-8Mildly toxic to petsIndoor Typically reaches 1.5–2 m (5–6.5 ft) tall by 1–1.5 m (3–5 ft) wide after 15–20 years.

Watering rhythm

Direct sun (at least 4-6 hours)

Weekly when young; less once established

Light

Direct sun (at least 4-6 hours)

Soil

Moist, well-drained, slightly acidic to neutral loam

Humidity

Moderate ambient

Temp

-20°C to 35°C

Pet safety

Mildly toxic to pets

Mature size

Typically reaches 1.5–2 m (5–6.5 ft) tall by 1–1.5 m (3–5 ft) wide after 15–20 years.

Care at a glance

Light

Most houseplants will scorch where stoneham gold western red cedar thrives. Give it the windowsill you'd otherwise leave empty because everything else burned there. Full sun is preferred for the best golden colour; at least 6 hours of direct sun daily. Shelter from cold, desiccating winds helps prevent foliage scorch. A plant moved abruptly from low light to direct sun bleaches in 48 hours — always acclimatise over a week.

Watering

Aim for weekly when young; less once established for stoneham gold western red cedar, 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. Keep soil evenly moist but never waterlogged. Young plants need consistent watering; established specimens tolerate short dry spells but dislike prolonged drought.

Soil and pot

Stoneham Gold Western Red Cedar grows best in moist, well-drained, slightly acidic to neutral loam. Prefers a pH of 6.0–7.0. Avoid heavy clay or permanently wet ground as Phytophthora root rot is a real risk. 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

Stoneham Gold Western Red Cedar sits happiest at around Moderate ambient humidity and -20°C to 35°C (-4°F to 95°F). Tolerates typical outdoor humidity; good air circulation reduces risk of fungal twig blight. Avoid planting in frost pockets or exposed windswept positions. 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 stoneham gold western red cedar sparingly. Apply a slow-release granular conifer fertiliser in early spring; avoid high-nitrogen feeds in late summer as they promote soft growth vulnerable to frost. 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 stoneham gold western red cedar in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Phytophthora root rotFoliage browns from the base up on waterlogged or poorly drained soils. Improve drainage before planting and avoid overwatering; no chemical cure once established.
  • Thuja blight (Didymascella thujina)Causes brown, dead patches in the inner foliage, particularly in wet seasons. Improve air circulation, remove affected material, and apply a copper-based fungicide as a preventive in spring.
  • Bagworm (Thyridopteryx ephemeraeformis)Spindle-shaped silk bags hanging on branches; larvae strip foliage. Remove bags by hand in winter and apply biological control (Bt) against young caterpillars in spring.

Propagation

Semi-ripe cuttings taken in late summer–early autumn, treated with rooting hormone and rooted under gentle bottom heat; layering is also possible but slow. 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

Stoneham Gold Western Red Cedar is mildly toxic to pets. Thuja plicata is not on the ASPCA's toxic plant lists but contains thujaplicin and plicatic acid, natural oils that can cause gastrointestinal upset, skin irritation, and respiratory discomfort if ingested or inhaled in quantity by cats or dogs. Classify as mildly toxic; contact your vet if ingestion occurs. 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.

Stoneham Gold Western Red Cedar care — frequently asked questions

What is the common name for Thuja plicata 'Stoneham Gold'?

Thuja plicata 'Stoneham Gold' is most commonly called Stoneham Gold Western Red Cedar, but it is also known as Stoneham Gold Western Red Cedar, Stoneham Gold Giant Arborvitae, Western Redcedar 'Stoneham Gold'. The names refer to the same species, so care instructions for Stoneham Gold Western Red Cedar apply identically to anything sold as Stoneham Gold Giant Arborvitae.

How much light does stoneham gold western red cedar need?

Stoneham Gold Western Red Cedar grows best in direct sun (at least 4-6 hours). Full sun is preferred for the best golden colour; at least 6 hours of direct sun daily. Shelter from cold, desiccating winds helps prevent foliage scorch.

How often should I water stoneham gold western red cedar?

Water stoneham gold western red cedar weekly when young; less once established. Keep soil evenly moist but never waterlogged. Young plants need consistent watering; established specimens tolerate short dry spells but dislike prolonged drought. 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 stoneham gold western red cedar toxic to cats and dogs?

Stoneham Gold Western Red Cedar is mildly toxic to pets. Thuja plicata is not on the ASPCA's toxic plant lists but contains thujaplicin and plicatic acid, natural oils that can cause gastrointestinal upset, skin irritation, and respiratory discomfort if ingested or inhaled in quantity by cats or dogs. Classify as mildly toxic; contact your vet if ingestion occurs.

What USDA hardiness zone does stoneham gold western red cedar grow in?

Stoneham Gold Western Red Cedar is rated for USDA zone 5-8 and RHS hardiness H7. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Stoneham Gold Western Red Cedar deep-dive guides

Every aspect of stoneham gold western red cedar care, each with its own calibrated guide:

Featured in these plant shortlists

Stoneham Gold Western Red Cedar qualifies for 2 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Stoneham Gold Western Red Cedar is also known as Stoneham Gold Western Red Cedar, Stoneham Gold Giant Arborvitae, and Western Redcedar 'Stoneham Gold'.