There was a witch

There was a witch once lived in a tree,
as witchy as any old witch could be --
not that you'd know, for she dressed quite so,
sometimes as duchess, sometimes as queen,
but never were witch's rags to be seen.

The bones of the tree were as dry as hers,
but she'd wrap herself in some sumptuous furs
(under which she'd wear but never a stitch)
and fly to her mansion of musty smells
in the land of voodoos and spells.

The twigs of her broom were coming apart.
They should have told her. They hadn't the heart.
So the three pet birds she kept in the tree --
Tax and Id and the long-dead Dermy --
tweeted to warn: Stay away from the sea!

But slowly the witch lost power to the deep.
(Old adversaries these, concerned to keep
their secret enigmas inviolate.)
(It seemed inevitable that the weight
of Nature's mysteries would seal her fate.)

A late submission to This week's prompt at The Mag.