Eastern Red Cedar (Red Cedar) care

Light

Eastern Red Cedar needs sun on the leaves, not just bright ambient room light. Requires full sun for dense growth and best form. Tolerates very light shade but becomes open and sparse, with reduced cone production. Naturally colonises open, sunny disturbed ground, roadsides, and old fields. Ideal for exposed, unshaded positions where more delicate conifers struggle. 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 eastern red cedar low; drought-tolerant once established; water young transplants for 1–2 seasons. 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. The most drought-resistant conifer native to eastern North America. Once established, thrives on natural rainfall with no supplemental irrigation. Young transplants need regular watering for the first 1–2 seasons to establish a deep root system. Avoid waterlogged soils — good drainage is essential.

Soil and pot

Eastern Red Cedar grows best in well-drained, dry to moist; chalk, clay, sand, loam, or rocky soil. One of the most soil-tolerant conifers available, growing in dry chalk and limestone outcrops, heavy clay, poor sandy soils, and loam, provided drainage is reasonable. Tolerates pH 4.5–8.0. Thrives where most other conifers fail, including dry rocky hillsides and exposed alkaline slopes. 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

Eastern Red Cedar sits happiest at around 30–70% humidity and -35°C to 38°C (-31°F to 100°F). Naturally adapted to a wide range of humidity levels across eastern North America, from humid coastal plains to dry, continental interior climates. Does not require supplemental humidity. Good air circulation helps reduce the incidence of fungal diseases. Tolerates urban pollution better than most conifers. 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 eastern red cedar sparingly. Rarely requires fertilising in typical garden or landscape conditions. Apply a balanced slow-release conifer fertiliser in spring only if the plant shows poor growth or pale foliage indicating nutrient deficiency. Rich feeding is unnecessary and can increase susceptibility to pests and diseases. 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 eastern red cedar in the Growli community. Each is annotated with the most common cause so you know where to start.

• Cedar-apple rust — Gymnosporangium juniperi-virginianae, a fungal disease requiring both eastern red cedar and apple or crabapple to complete its life cycle, produces orange gelatinous telial horns on cedar branches in wet spring weather. Remove galls before they mature, avoid planting near rosaceous trees, and apply preventive fungicide if both hosts are present.
• Bagworm infestation — Thyridopteryx ephemeraeformis (bagworm) can defoliate and eventually kill branches or entire plants if infestations are severe. Remove and destroy bags by hand in winter before eggs hatch. Apply Bacillus thuringiensis (Bt) spray when small caterpillars first emerge in late spring.
• Tip blight (Phomopsis) — Phomopsis tip blight causes brown, dying shoot tips especially on young or stressed plants in cool, wet spring conditions. Prune out affected shoots well below the infection zone and destroy the material. Improve air circulation and avoid overhead watering. Apply copper-based fungicide as a preventive in wet springs.

Propagation

Take semi-ripe cuttings in late summer (8–12 cm) from current-season growth, dip in rooting hormone, and insert into gritty cutting compost in a cold frame or cool glasshouse. Rooting takes 3–6 months. Seed requires double dormancy — warm stratification followed by cold stratification (90 days each) — making vegetative propagation from cuttings far more practical for home growers. 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

Eastern Red Cedar is mildly toxic to pets. Juniperus virginiana shares the mild toxicity profile of the Juniperus genus. UC Davis classifies Juniperus species as mildly toxic (class 2) to pets and livestock, with potential for vomiting, diarrhea, and GI irritation from ingestion of berries or foliage. Cedar wood oil extracted from the heartwood can cause skin irritation. The ASPCA does not specifically list this species, but veterinary guidance consistently advises preventing pets from consuming juniper plant material in quantity. The blue-green berry-like cones attract birds (especially cedar waxwings) and are an important wildlife food source. 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.

Eastern Red Cedar deep-dive guides

Every aspect of eastern red cedar care, each with its own calibrated guide:

• Eastern Red Cedar watering schedule
• Eastern Red Cedar light requirements
• Best soil mix for eastern red cedar
• Eastern Red Cedar fertilizing guide
• When to repot eastern red cedar
• How to propagate eastern red cedar
• Eastern Red Cedar growth rate & size
• Eastern Red Cedar cold hardiness
• Eastern Red Cedar temperature & humidity
• Is eastern red cedar toxic to cats & dogs?
• Is eastern red cedar toxic to cats?
• Is eastern red cedar toxic to dogs?
• Getting eastern red cedar to bloom

Featured in these plant shortlists

Eastern Red Cedar qualifies for 3 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best drought-tolerant houseplants — Houseplants that prefer to dry out — forgiving of forgotten watering and ideal for travel or busy weeks.
• Best flowering houseplants — Indoor plants grown for their blooms — selected from the flowering species in Growli’s plant-care library.
• Best houseplants for full sun — Houseplants that want direct sun — the species for a hot south or west-facing windowsill where shade-lovers scorch.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Eastern Red Cedar is also known as Eastern Red Cedar, Red Cedar, Eastern Juniper, and Pencil Cedar.

• Superb pink care — light, water and common problems
• Farewell-to-spring care — light, water and common problems
• Elegant clarkia care — light, water and common problems
• All 6887 plant care guides in the Growli library