banyan-like Portugal laurel

I decided my privacy screen needed to be thinned when I tried to take a
photo of the house for an application for a house-trading club, and
couldn't see any bit of the house from anywhere.  I started in the corner
that was thickest, where I had planted a little Prunus lusitanicus about
thirty years ago.  To my surprise, I now had a grove of laurels.  The
branches had grown down to the ground, taken root, and a new trunk was
growing up from each branch end.  There were several dozen.  Is this
normal?  Usually I see this growing as a single-trunked tree.  Does it
require regular pruning to make it a tree, or do I have an unusually
droopy-branched one?

Diane Whitehead  Victoria, British Columbia, Canada  zone 8 cool medit.
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