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A wadi bed may have colonies of Rose of Jericho skeleton growing along it after water deposits their seeds during the winter rains. The plant is often found in large, dense concentrations because when rains fall on an open skeleton, the seeds drop and germinate in the damp soil near the mother skeleton. Seeds will not separate from the skeleton, however, unless enough rain has fallen to germinate the seeds. Rose of Jericho seeds geminate within eight hours, a rapidity which is essential since the plants must root while the soil is still wet.