Answer: It is possible to cut off the top and root it, but you will need to be patient. Here's the technique:
Cut off the top of the plant so that you have two tiers of branches. This should give you a piece that is 12 to 18" tall. Now, prune off the bottom tier of branches close to the stem. Insert the cutting into a moist rooting medium--soilless seedstarting mix should be fine--making sure that the area where you pruned the branches off is buried in the soil. Moisten well and place in a loosely-tied clear plastic bag. Place in a bright spot--but out of direct sun--where the tem is 65 to 75F. It may take weeks or months for the cutting to form roots. You'll know when you see new growth.
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