Adorned with, covered by, or characterized by hawthorn plants or their flowers and berries.
Past participle of 'hawthorn' used as a verb (to adorn with hawthorns), or more likely an adjective formed by adding '-ed' to 'hawthorn,' following English patterns for describing things decorated or covered with something.
Medieval poets constantly wrote about hawthorned hedgerows and hawthorned scenes—hawthorn blossoms were so spectacular in spring that they became symbols of England's beauty!
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