Simple past tense and past participle of garden.(verb)
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Use "gardened" in a sentence
"I have never successfully "gardened" anything in my life before!!!"
"These are the processes that have "gardened" the Moon in its 20 or so passes around the Milky Way galaxy since it and the Earth were formed, producing the fine regolith that shows those crisp boot prints now."
"Nothing lasts forever, which is why we have to get out of here someday before the Earth is "gardened" by a giant asteroid or the swelling Sun."