Pinus wallichiana – Bhutan Pine (Himalayas)
(= P. griffithii, P. exelsa)
Habit: A powerful, elegant large tree, (15) 20-30 m tall, 6-10 (12) m wide; broadly conical when young, becoming increasingly loose to asymmetrical with age; branches horizontal to arching, twigs hanging loosely; medium-growing, 30-50 cm a year.
Fruits: Cones appear from about the 10th year on, initially green-violet, slender, like bananas with pearls of thick resin, light brown when mature, 15-25 cm long, cylindrical.
Leaves: Needles in fives; soft, glistening, blue-green needles, 10-20 cm long, loosely hanging; like banners.
Roots: Far-reaching, shallow, moderately deep; sensitive to soil compaction.
Demands: Sun, needs warmth, likes protected areas, moderately frost hardy; sensitive to wind.
Soil: Moderately dry to moist; sensitive to dampness; prefers acidic to neutral, well drained substrates, not growing on chalky or heavy soil.
Hardiness: Zone 7a