The only thing I would add to Piper's list is:
Dividing
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The only thing I would add to Piper's list is:
Dividing
Hmmm - how long of a talk are you giving? With all the suggestions you could do a week long class. Perhaps you should test out what your audience may want to know - like what type of orchids are easiest, and how to pick a "good" one, and where they can download culture information...