A Passing

[heslopian]

It bore the fern and ash; unfurled a spell "Unfurled a spell" is great. Connecting magic with nature has a pagan feel, which I like.
of loose barked silver birch and stretching oak. Should "loose" and "barked" have a dash between them?
Then dallied by the poplar's narrow stroke What is this entity you're referring to, which bore fern and ashed and tried to woo a thrush?
to woo a hermit thrush that trilled along
a branch; its spotted breast so proud in song. The semi-colon seems, to me, like it should be a comma, as the latter clause ("its spotted breast") connects perfectly well to its predecessor without needing such a definite divide.
The parted bluebells blushed within the glade Great use of "blushed".
as chorused foxglove sang inside the shade, This should be a semi-colon, I think, as the next line, which introduces a "me", doesn't follow the previous thought. In fact, the last line of this verse might be stronger if you make it its own sentence.
the mottled woodland wrapped me in its shell. Great use of "mottled". This poem uses adjectives like a boss

The years, like winds of old are cast away
and with them, died the splendour of the trees. Is the comma here needed? This line is really all one clause, so dividing it makes it read awkwardly; the comma would be better placed after "cast away", I think.
No more the summer's dell, and gone the trails;
as sewerage pipes are threaded through the brae. "Sewerage pipes" has a great, almost shocking effect, because it's the first mention of modern technology in a previously au natural poem. Furthermore, it's technology which does an ugly (if necessary) job, so we go from serene woodland to shit and piss. It's a subtle but stunningly effective technique.
The wooded hills no longer stand at ease.
Now terracotta houses rise like sails. Great closing line.

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2nd edit. i did play with the rhyme on L's 1 and 8, as well as some tinkering elsewhere. thanks again to all who helped.

I really enjoyed this poem. It was heavily structured and deeply effective. My nits, as you can see, are mostly grammatical. The only one that really bothers me is what that entity you allude to in the first half of the first verse is. Is it the wind? All critique is, of course, JMHO. Thank you for the read, Bilbo