Answer: If the leaves are a healthy green and you don't see any yellow spots or streaks, the holes are probably caused by some kind of insect. Snails and slugs usually leave a slime trail as evidence of their visit. If you can't find any insects, you can't really treat the problem. Check the plants at night to see if earwigs or some other night-feeding creature is getting to them. If you find the pest, pick him off and destroy him. There's not much else you can do at this point - sorry!
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