Simple past tense and past participle of pollard.(verb)
That has been cut back heavily in order to produce dense new growth(adjective)
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Use "pollarded" in a sentence
"'pollarded' - or have their tops cut off - to maintain their long term safety and sustainability."
"We went through country characteristic of the levels: narrow causeways lined by pollarded willow, where banks protect the roadway from the often swollen rhynes."
"The new growth of pollarded curly or corkscrew willow, Salix matsudana is pleasing against the dark green background of the Hemlocks."