Answer: Without more detail, it's impossible to say, and there are many possibilities. Does the foliage look ragged, like a larger creature with teeth (rabbits, deer, rodents) is nibbling? Small marks, like caterpillar or cutworms? You might ask neighbors about possible culprits in the area to narrow your choices, put chicken wire around them (if nibbling continues, it's an insect that can get through the holes), sprinkle powder to look at tracks, etc. Good luck!
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