PlantFun
Plant Needs
Sunlight
Full sun exposure required for healthy growth; tolerates minimal shade in early sapling stages
Watering
Drought-tolerant once established; water young saplings regularly to support root development
Temperature
Hardy to -15°C; thrives in warm temperate to subtropical climates; tolerates high summer heat
Characteristics
- Leaf: Long, dark green needles in fascicles of 3, 20–45 cm long, persistent for 2–4 years
- Cone: Ovoid, woody female cones 15–25 cm long, maturing in 2–3 years
- Stem/Bark: Thick, reddish-brown bark with deep furrows, providing fire resistance
Care Guide
Watering
Water young saplings 1–2 times weekly; mature trees need no supplemental watering
Fertilization
Apply slow-release granular fertilizer once in early spring. Use fertilizer with balanced nitrogen, phosphorus, and potassium for young saplings
Eggshell powder topdressing：Crush dried eggshells into fine powder; sprinkle thinly around base of saplings; avoid direct contact with trunk to prevent rotPruning
- Remove dead or damaged branches in late winter to improve airflow
- Thin lower branches as tree matures to encourage upright growth
- Avoid heavy pruning; longleaf pines have slow growth and limited regrowth capacity
Toxicity
Warning: this plant may be toxic.
Pets & Humans
Pets: ASPCA: Mildly toxic; ingestion of needles may cause vomiting, diarrhea, lethargy
Humans: Ingestion of large quantities of needles may cause mild gastrointestinal irritation
Garden Uses & Culture
Culture: Symbolizes southern US forest ecosystems and timber industry heritage
Usage: Timber production; wildlife habitat; erosion control in coastal plains
