Aristolochia macrophylla (= A. durior; A. sipho)
(eastern North America)
Habit: Twiner/trellis climber, 8-10 m tall, 1-8 m wide; support diameter 2 (3) cm; initially very slow growing, after the 3rd-5th year fast-growing, 150-200 cm a year.
Flowers: Inconspicuous, like pipes, greenish brown, end of April to May.
Fruits: Rare, some 10 cm long, like cucumbers, green, unpalatable.
Leaves: 10-30 cm, cordate, leathery, deep green, pale yellow from November; dense and without gaps, leaves overlapping like roof tiles.
Demands: Sun to shade, not sensitive to sun, tolerates sun in moist soil, extremely frost hardy, good for urban areas, moderately tolerant of wind.
Soil: Fresh to moist, in all somewhat nutritious substrates.
Hardiness: Zone 5a