The leaves of my basil and mint plants seem to go partly missing or develop holes: what could be happening?

Question

I try visit the garden site at different times of the day and even tried a couple of times during the night but I have never seen any pest attacking the leaves.

Answer 1

A lot of munching happens at night on plants like these. Here's an article that will apply to the mint, as well: https://www.gardeningknowhow.com/edible/herbs/basil/holes-in-basil-leaves.htm