Alnus cordata – Italian Alder (Italy)
Habit: Small to medium-size tree, (8) 10-15 m tall, 3-6 m wide, initially conical, later ovoid crown, branches hardly overhanging, horizontal to upright; medium to strong-growing the first 20 years, later slow-growing.
Flowers: Yellowish catkins in March; before leaves shoot.
Fruits: Large, conspicuous syncarpy like cones, very decorative in winter.
Leaves: Shoots mid-May; leathery, shiny dark green, cordate leaves, persistent till end of November.
Roots: Shallow roots, no runners; collect nitrogen.
Demands: Full sun to light shade; very adaptable; tolerates warmth well, somewhat susceptible to frost when young; tolerates urban pollution, very wind resistant.
Soil: Moist to moderately dry, all soil.
Note: Somewhat like pear trees in shape.
Hardiness: Zone 6b