Developing the metaphor...
I want to use hedgerow in line 3 to make the idea of stitched seams clearer so I will delete it from line 2 and substitute ‘hillside’ which works better anyway.
Offa’s land, the landscape of the Marches
Is rich in hillside, field and tree
The panorama stitched together hurriedly
By lines of hedgerows and the odd patch
Of …………… and hemmed in by ditch and lane
(Line 2 is two beats short; ‘panorama’ and ‘hurriedly’ are place-savers for the moment.)