Jack Pine
Scientific Name: Pinus banksiana
Common Names: Jack Pine, Banksian Pine, Gray Pine, Scrub Pine
Family: Pinaceae
Native Range: Northern and central Ontario; widespread across Canada; parts of northern U.S.

Typical Height: 20 m (65 ft)
Maximum Recorded Height: 30 m
Trunk Diameter
Average: 30 cm
Maximum: over 90'' radius (Boundary Waters title holder at 95'')
Growth Rate: Medium–Fast

Lifespan
Typical: 80+ years
Record: 150 years
Seed Maturity: 5–10 years. Remain closed, attached to the tree for 10-20 years. Fire releases the serotinous cones seeds however persistent fires repeated <15yr intervals can eliminate the seed supply.
Reproductive Cycle: Most years after maturity
Soil Preferences: Sandy, gravelly, coarse, or shallow soils; well-drained
Water Needs: Tolerant of drought; moderately tolerant of short-term flooding
USDA Hardiness Zones: 2–4

Fire Resistance: Medium
Fire Regeneration: High.  Evolved to survive! Cones open with heat.. thrives in post-fire sites
Shade Tolerance: Low.. requires full sunlight
Strength Rating: Moderately hard and heavy
Decay Resistance: Moderate
Pest/Disease Resistance: Susceptible to rusts, sawflies, weevils, budworm as well as saplings and young trees browsed by deer/hare
Climate Adaptability: Withstands –40°C to +35°C; frost resistant in spring

Uses
Timber: Construction, railway ties, poles, pulp, mine timbers
Non-timber: Wildlife habitat, fire-adapted seedbed creation
Ecological Role: Supports Kirtland’s warbler (endangered), squirrels, birds
Stabilizes soil, forms canopy in dry, poor-quality sites
Cultural/Historical Significance: Used historically for construction, pulp, and poles; fossil evidence shows survival through glacial periods

Bark
Young trees: Thin, reddish-brown to gray
Mature trees: Dark brown, flaky, furrowed into irregular plates

Needles
Bundles of 2
Length 2–4 cm
Straight or slightly twisted, stiff, sharp-pointed, light yellow-green

Cones
Size 3–7 cm, oblong to conical, sometimes curved inward
Scales thickened at tips, resin-sealed, often persistent 10–20 years
Open with heat (fire or sun)

Seeds
3 mm, dark brown/black, wing ~10 mm
Dispersed by wind, released from cones after fire or heat

Growth Form Shape: Conical when open-grown, slender/straight in forests
Height: 20–30m... Slightly tapered
Reproductive Features: Male/female cones separate on same tree
Pollination: Wind
Seed maturity: 5–10 years
Unique Features: Only native 2-needled pine in eastern Canada
Fire-adapted, even-aged stands form post-burn
On poor soils, can appear short, twisted, with sparse crown
Kirkland Warbler nests in pure stands (6m high and >30Ha)
Research suggests the species survived glacial period.

Summary
Foliage Details: Stiff, sharp-pointed needles, spread apart in bundle, persistent sheath
Cones: Clustered in 2–3 at branch nodes; yellow-brown at maturity
Bark: Smooth gray to reddish-brown when young, dark brown and flaky with age
Threats: Rust diseases, insects (budworm, sawfly), overbrowsing
Carbon Sequestration: Moderately effective; fast growth on poor soils