a penny for your thoughts

I wrote a sonnet for a class assignment, and I want to know what you guys think. So PLEASE comment, and feel free to critique. If something doesn't make sense or sounds funny or awkward, please tell me! For those of you who don't live in English world, a sonnet (the English, anyway) is a 14 line poem, written in iambic pentameter (10 syllables with the accent being on every other syllable,) with the rhyme scheme being ABABCDCD, etc...then the sonnet ends with a rhyming couplet (the last two lines.) I will say that I do follow the formalist requirements, only my iambic pentameter isn't perfect...I do have 10 syllables in each line, but my stressed and unstressed syllables aren't perfect, which isn't a big deal.

Here goes.
Oh, and I'd love to have thoughts on what you make of the content.
Thanks guys!

Trees that Die

The trunk stands crooked, shedding woodchip scales;
the leaves are red and gold and fading green;
the knobby arms with bony fingers fail
to reach the clouds that taunt and sky that cleans
the earth and roots with a freefalling sea.
The storm sends wind, caressing branch and bloom,
and thunder vibrates heating air, a tease
that tempts barky spine to release its tomb
of guarded and logical heart. Trees strain
and reach for the atmospheric borders,
roots wiggle through the mass of soft terrain,
they spiral down like lightning that orders--
"Depart from me" He accents with a bolt,
as leaves float down like hands He couldn't hold.