The idea of nature having an easy or hard time holding onto something is an example of personification. And not only is nature personified here, it's actually made into a female figure.
You know what else we notice about this line? Check out all those H sounds. That's some major alliteration right there. And it this short line, all those rapid-fire H sounds right in a row force us to slow down and really ponder over the meaning.
Then there's the rhyme. Hold rhymes with gold, which means we've got a rhymed couplet here.
And since these lines have the same number of syllables, we're gonna go ahead and assume there's a meter in play, too. In fact, there is—iambic trimeter, to be precise. Be sure to click on over to our "Form and Meter" section for more.