PlantFun
Plant Needs
Sunlight
Full sun exposure is required for mature trees; young saplings tolerate partial shade to reduce transplant stress
Watering
Deep, infrequent watering to encourage deep root growth; allow top 15–20 cm of soil to dry between waterings
Temperature
Cold hardy to -20°C; withstands summer heat up to 35°C with adequate soil moisture
Characteristics
- Leaf: Needles in bundles of 5, blue-green, 15–30 cm long, soft and flexible
- Cone: Largest of all pine cones, 20–50 cm long, brown when mature, with thick, woody scales
- Stem/Bark: Thick, furrowed, reddish-brown bark on mature trees; young stems have smooth, gray bark
Care Guide
Watering
Deep soak every 7–10 days during dry periods; avoid wetting foliage to prevent fungal disease
Fertilization
Apply slow-release granular fertilizer in early spring to support new growth. Use a balanced fertilizer with equal N-P-K ratios to support overall health
Eggshell powder top-dress：Crush dried eggshells into a fine powder; sprinkle 1–2 cups around the tree’s drip line; water thoroughly to release nutrients and avoid pest attractionPruning
- Remove dead, broken, or diseased branches in late winter to minimize disease spread
- Thin crowded lower branches to improve air circulation and light penetration in the canopy
- Avoid heavy pruning; preserve the tree’s natural pyramidal form during youth to support structural integrity
Toxicity
Warning: this plant may be toxic.
Pets & Humans
Pets: ASPCA: Non-toxic; no known adverse effects on cats
Humans: No known toxic effects to humans; sap may cause mild skin irritation in sensitive individuals
Garden Uses & Culture
Culture: Revered by some Indigenous tribes of western North America for its durable wood and edible sap
Usage: Commercial timber production; ornamental landscape tree; sap can be boiled to make a sweet syrup
