http://www.poetryfoundation.org/poem/238104. An audio recording of the poem by the poet may be found here: https://media.sas.upenn.edu/pennsound/authors/Williams-WC/02_Library-of-Congress_05-05-45/Williams-WC_34_Flowers-by-Sea_Library-of-Congress_05-05-45.mp3. A brief biography of Williams and references may be found here: http://eretzsongs.blogspot.com/2014/08/the-songs-of-eretz-poet-of-month-for.html.
While organized in four couplets, "Flowers by the Sea" has a ballad-like lilt to it, a rhythm perhaps meant to evoke ocean waves. The poet imagines that flowers may be thought of as waving like water, and that the ocean may be thought of as a gigantic plant whose stem is the earth itself. Note the pun "tied" (for tide) in the fourth line, which is where the grand metaphors begin.