Simple past tense and past participle of mulch.(verb)
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Use "mulched" in a sentence
"I love the opening about publishing people never using the word "mulched" for sensitive authors too afraid to question what happens to all their unsold books."
"I only realised what had happened when she asked what the 10 sqr ft of Xmas glitter was on her freshly 'mulched' lawn."
"The issue of People with my cover was recycled and mulched with all the other magazines."