Hey Ketamascience,
Thoose are done by insects, i would advice you to get some spray to prefend more damage.
Since your are growing outside, the chance of many insects is high.
I would recommend to buy CANNA CURE, it not only prefends, it makes a biological layer and it even holds some usefull nutrients in it for the leafs.
Just spray once a week and you will be fine, im doing the same thing.
Goodluck growing :)