Germination: Seeds must be warm (~75F) stratified for 30 days to allow the small embryo to grow inside the seed. This is followed by moist chilling stratification for 60 days to satisfy physiological dormancy. Following stratification, sow seeds in a nursery container to produce a seedling or sow them in a plastic container in the classroom to observe germination.
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A large shrub or small tree, native to the southwestern US and the north of Mexico, growing in hot, dry conditions, in canyons and on rocky slopes at elevations between 1200 and 2400 m.
It has a somewhat irregular growth habit and produces a crooked trunk with scaly bark, oval-shaped leaves and clusters of yellowish green flowers, followed by winged, papery pods of seeds. A nice ornamental, tolerant of drought and poor soils.