Ailanthus altissima – Tree of Heaven (= A. glandulosa)
Habit: Broadly round crown, large tree, 18-25 m tall, final size depends greatly on climate; (8) 10-15 m wide; twigs slightly overhanging, more horizontal or upright; grows crooked with too little light; fast-growing, 50-80 cm a year, young shoots up to 120 cm and more per year.
Flowers: Usually dioecious, greenish panicles, June, staminate flowers with pungent smell.
Fruits: Inconspicuous brownish fruit wings, reddish before ripening.
Leaves: Pinnate, leaves shoot late; dark green, shiny, leaves fall in November.
Roots: Shallow and far-reaching, lifting pavements when cramped; forms runners up to 15 m long when roots are damaged.
Demands: Only in sun; tolerates heat and drought very well; sensitive to frost in unfavourable areas; god for urban areas; very resistant to industrial pollution.
Soil: On all soil except coarse gravel, not demanding, tolerates salt.
Note: Old trees, 80+ years, have rigid branches that break easily. Check tree in time.
Hardiness: Zone 6b