Answer: The seeds of Malosma laurina Nutt. or Rhus laurina Nutt. have hard, impervious seedcoats. Chipping of the seed coat should be tried, however the recommended procedure is soaking in hot water (180-200 degrees F.) No information on the length of soak was available but start with 1 hour and if that doesn't work, increase the length. Other species of sumac require anywhere from 1 hour to 24 hours, so you'll have to experiment. .
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