Most poetry I have seen, especially free-form, is written in broken lines. These lines them run into other lines and so not have any punctuation.
Some have explained this using enjambment. Where I have seen enjambment being useful are in lines which have to keep a rhyme scheme but are too long; for example
Never did I ever
Think or even wonder
That this country
Which I live in
Would make me begin to (tah)
p.s: there could be a comma between "think" and "or", or even at the end of the lines.
Other people explain the lack of punctuation to be style. Some claim the introduction of punctuation would constrict the readers to one particular voice.
This is not just seen in free-form or open-form poems. But poems to form also sometimes lack punctuation.
Should I be punctuating my poems or no?