The leafless landscape seems dead, but dormancy is only a false death.  In the 1/24 issue of the New York Times Michael Tortorello takes us on a wintry horticultural tour of gardens in New York City and learns that death is not what winter brings. I grant you, the activity he sees in Central Park and other places is rather different from the dormancy I can see in my frozen snowy landscape, but still, his guides make…