Cedar of Lebanon (Lebanon Cedar) care

Light

Cedar of Lebanon needs sun on the leaves, not just bright ambient room light. Demands full sun. Open, unobstructed sun exposure from all sides develops the classic flat-topped, wide-spreading layered crown. Shade produces a poor, asymmetric form and reduces vigour. Site in an open lawn or parkland position. 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 cedar of lebanon weekly during first 3 years; very drought-tolerant once established. 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. Naturally adapted to the dry, summer-parched mountains of the eastern Mediterranean. Once established, among the most drought-tolerant large conifers available for temperate gardens. Water deeply and infrequently during establishment; mature trees rarely need irrigation.

Soil and pot

Cedar of Lebanon grows best in well-drained, deep, neutral to alkaline loam, chalk, or rocky soil. Thrives in deep, well-drained soils including chalk and limestone with pH 6.5–8.5. More tolerant of alkaline and rocky soils than most conifers. Exceptional drainage is essential; does not tolerate waterlogging under any circumstances. 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

Cedar of Lebanon sits happiest at around Low to moderate (25–55% RH) humidity and -25 to 40°C (-13 to 104°F). Adapted to the dry, continental mountain climate of the Levant with hot, dry summers and cold, snowy winters. Tolerates low humidity well. Grows successfully in maritime climates such as the UK if drainage is excellent and winters are not excessively wet. 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 cedar of lebanon sparingly. Established trees in suitable soils need no supplemental fertiliser. Young trees may receive a balanced slow-release conifer fertiliser in early spring for the first 3 years. High-nitrogen feeds are counterproductive, reducing drought hardening and bluish needle colour. 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 cedar of lebanon in the Growli community. Each is annotated with the most common cause so you know where to start.

• Cedar bark beetle (Phloeosinus cedri and related species) — Bark beetles attack weakened or drought-stressed trees, boring galleries under the bark and causing branch dieback. Maintain tree vigour through proper siting and establishment watering. Remove and destroy infested branches promptly.
• Honey fungus (Armillaria species) — Armillaria root rot can infect trees on sites with old tree stumps or decaying roots. Symptoms include sudden wilting, resin bleeding at the base, and white mycelium under bark at the root collar. No cure; prevent by removing old stumps before planting and improving drainage.
• Insufficient space for mature spread — Cedar of Lebanon ultimately develops a vast, spreading crown — often 20 m or more across in old specimens. Planting near buildings, driveways, or infrastructure is a serious long-term planning error. Reserve open parkland or large estate lawn positions only.

Propagation

Propagate from seed collected from mature cone scales (cones disintegrate on the tree). Cold-stratify cleaned seed for 21–42 days at 2–4°C before sowing in spring in well-drained, slightly alkaline compost. Germination is reliable. Named forms (e.g., 'Glauca', 'Sargentii' weeping) are grafted onto seedling rootstocks. 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

Cedar of Lebanon is mildly toxic to pets. ASPCA lists Cedrus libani and Cedrus species as toxic to dogs and cats. Ingestion of foliage or bark may cause vomiting and skin irritation due to aromatic essential oils and resin. Classified as mildly toxic; significant toxicity is uncommon but pets should be discouraged from chewing on the tree. 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.

Cedar of Lebanon deep-dive guides

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

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

Featured in these plant shortlists

Cedar of Lebanon qualifies for 5 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.
• 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 fast-growing houseplants — Houseplants documented as fast or vigorous growers — quick to fill a pot, cover a pole or trail down a shelf.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Cedar of Lebanon is also commonly called Cedar of Lebanon or Lebanon Cedar.

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