A Passing

[Brownlie]

Alright I'll do my best here, but obviously Leanne and Milo have the most credibility

It carried scent of ferns, unfurled a smell -- From what I can see this line is perfect IP. Leanne may have a point on the it.
of loose barked silver birch and stretching oaks. --This line has an extra syllable and I'm not positive but I think Loose is stressed so loose bark may be a trochee
Then dallied by the poplar's narrow strokes -- whether the word "by" is stressed I am not certain.
and wooed a hermit thrush that trilled along-- An extra foot in this line, also "wooed a" may be a Pyrrhus if "ed" counts as an unstressed syllable but I like the words used to describe the songbird.
on branch; its spotted breast so proud in song. -- Perfect IP hereThe parted bluebells swayed, within the glade -- Internal rhyme works beautifully here, but I'm unsure if bluebells is a spondee if you think it might be look up the word in the dictionary to settle the matter
as chorused foxglove sang aloud in shade, -- I think chorused is alright in terms of meter it depends if "ed" is its own syllable. Now I'm not sure if foxgloves can sing aren't they flowers. One could argue that the language is figurative though it's your call I suppose
the mottled woodland wrapped me in its spell.-- There is an extra syllable here also "in its" may be a Pyrrhus

The years, like winds of old have bled away -- I suppose this may sound a bit emo maybe use the word "blown"
and with them flew the softness of the trees. -- Softness sounds pleasant to the ear but is that the adjective you want to use to communicate your message?
now terracotta houses rise like sails. -- Good line that is perfect IP, but I would suggest looking up terracotta if you haven't already. Did you mean the terracotta soldiers or the building material?
and sewerage pipes are threaded through the brae.-- I would change sewerage to sewer, if you do I believe the line will be in perfect IP
No more the wooded hills, no more the breeze. -- Perfect IP here from what I can discern
No more summer's dell, no more the vales. -- You have a spondee in this line that I believe led to the metrical error of having only nine syllables "More Summer" More and Sum are both stressed. The anaphora makes the end more dramatic which I believe works well.

I went through the poem and found some minor errors that can be fixed, I think the poem could definitely benefit from editing, but I still things it is a great poem. I really hope you edit it.

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i pronounce sewerage as sew ridge