Beware the Hawthorne Tree

Beware the crimson Hawthorne tree--
Not because of its circlets of thorn
Or it blossoms that smelt of death
in London when the plague came
and reaped her streets.

Beware because a faery may lead you beneath
And when you emerge, blinking, seven
Mays later, you'll discover the blossoms,
which you dreamed of deep in winter,
have already bled from the tree.