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Plant care

Dwarf White Cedar (Andelyensis Atlantic White Cedar) care

Chamaecyparis thyoides 'Andelyensis'

Also called Dwarf White Cedar, Andelyensis Atlantic White Cedar, Atlantic White Cedar.

RHS H5USDA 4-8Mildly toxic to petsIndoor 1.5–2 m tall and 0.5–0.8 m wide after 10 years

Watering rhythm

Direct sun (at least 4-6 hours)

Regular to frequent; tolerates wet soils and does not require drought management

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Light

Direct sun (at least 4-6 hours)

Soil

Moist to wet, acidic, organic or sandy soil

Humidity

Moderate to high

Temp

-25°C to 28°C

Pet safety

Mildly toxic to pets

Mature size

1.5–2 m tall and 0.5–0.8 m wide after 10 years

Care at a glance

Light

Dwarf White Cedar needs sun on the leaves, not just bright ambient room light. Thrives in full sun; at least 5–6 hours of direct sun per day maintains the best foliage colour and columnar form. It tolerates light partial shade but growth becomes more open and foliage colour less distinctive. 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 dwarf white cedar regular to frequent; tolerates wet soils and does not require drought management. 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. Uniquely among dwarf conifers, 'Andelyensis' can tolerate boggy or poorly drained soils; it grows naturally in Atlantic white cedar swamps and performs well alongside water features or in rain gardens. Water regularly and do not allow soils to dry out severely.

Soil and pot

Dwarf White Cedar grows best in moist to wet, acidic, organic or sandy soil. Prefers a pH of 4.5–6.0. It thrives in peaty, organic soils and tolerates standing water for short periods; this makes it valuable for rain gardens and wet borders where other conifers fail. Standard well-drained soil amended with peat or ericaceous compost also suits it. 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

Dwarf White Cedar sits happiest at around Moderate to high humidity and -25°C to 28°C (-13°F to 82°F). Native to humid, coastal, swampy environments; tolerates and benefits from high ambient humidity. Performs well in maritime and coastal garden settings. Not suited to dry, continental climates without additional irrigation. 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 dwarf white cedar sparingly. Apply an ericaceous or conifer-specific slow-release fertiliser in spring; the species is naturally adapted to low-fertility, acidic substrates, so avoid high-nitrogen feeds which produce lush, uncharacteristic growth. 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 dwarf white cedar in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Cypress aphid (Cinara cupressi) — Large, grey-brown sap-sucking aphids that colonise stems and cause yellowing or browning patches on foliage; infestations are typically noticed in spring and early summer. Inspect in late winter, treat with pyrethrin-based spray, and encourage natural predators.
  • Winter foliage bronzing — The blue-green foliage naturally takes on grey-purple or bronze tones in cold winters, which is normal and not a sign of disease; however, severe wind scorch on exposed sites can cause permanent browning of foliage tips. Shelter from cold, desiccating winds in colder zones.

Propagation

Semi-ripe cuttings with a short heel taken in late summer to early autumn, treated with IBA rooting hormone and overwintered in a cold frame, root reliably by the following spring. Seed is possible but cultivar characteristics will not be true from seed. 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

Dwarf White Cedar is mildly toxic to pets. Chamaecyparis thyoides is not specifically listed by the ASPCA, but the foliage of Atlantic white cedar contains aromatic oils typical of the cypress family that may cause mild gastrointestinal irritation in cats and dogs if ingested. Classified as mildly toxic as a precaution; veterinary advice should be sought if a pet consumes foliage. 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.

Dwarf White Cedar care — frequently asked questions

What is the common name for Chamaecyparis thyoides 'Andelyensis'?

Chamaecyparis thyoides 'Andelyensis' is most commonly called Dwarf White Cedar, but it is also known as Dwarf White Cedar, Andelyensis Atlantic White Cedar, Atlantic White Cedar. The names refer to the same species, so care instructions for Dwarf White Cedar apply identically to anything sold as Andelyensis Atlantic White Cedar.

How much light does dwarf white cedar need?

Dwarf White Cedar grows best in direct sun (at least 4-6 hours). Thrives in full sun; at least 5–6 hours of direct sun per day maintains the best foliage colour and columnar form. It tolerates light partial shade but growth becomes more open and foliage colour less distinctive.

How often should I water dwarf white cedar?

Water dwarf white cedar regular to frequent; tolerates wet soils and does not require drought management. Uniquely among dwarf conifers, 'Andelyensis' can tolerate boggy or poorly drained soils; it grows naturally in Atlantic white cedar swamps and performs well alongside water features or in rain gardens. Water regularly and do not allow soils to dry out severely. 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 dwarf white cedar toxic to cats and dogs?

Dwarf White Cedar is mildly toxic to pets. Chamaecyparis thyoides is not specifically listed by the ASPCA, but the foliage of Atlantic white cedar contains aromatic oils typical of the cypress family that may cause mild gastrointestinal irritation in cats and dogs if ingested. Classified as mildly toxic as a precaution; veterinary advice should be sought if a pet consumes foliage.

What USDA hardiness zone does dwarf white cedar grow in?

Dwarf White Cedar is rated for USDA zone 4-8 and RHS hardiness H5. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Dwarf White Cedar deep-dive guides

Every aspect of dwarf white cedar care, each with its own calibrated guide:

Featured in these plant shortlists

Dwarf White 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

Dwarf White Cedar is also known as Dwarf White Cedar, Andelyensis Atlantic White Cedar, and Atlantic White Cedar.