Hello Matt,
Two nice haiku - the first one has a lovely line-break on 'grow' for the double meaning.
The second one is a bit difficult for me to grasp - it comes across as clever word-play, but can be read as humorous nonsense I guess.
There might be a missed opportunity on the second line-
watching the trees grow - watching ..... trees grow, for bit of imagery, perhaps a species that ties in with 'surf sounds' ?
Thanks for sharing................Philip