Born in a Casket

If I look at this from a druidic point of view, the oak is knowledge, born in light, and it is through wisdom that we find strength.  It is the nature of the oak to share its bounty -- the acorn being one of the predominant symbols of life and fertility.  Of course, the oak also becomes gnarled and twisted with age and each new lump or bend adds to its beauty and interest. 

You do have "fragile white fingers" and later "throwing forth fine fingertip" -- I'd caution against this kind of repetition.  Also, do you mean "reinforcing"?

The final line is an absolute gem, one which does everything a poetic conclusion ought to -- that is, to not conclude at all, but to demand thought and force a re-reading of the poem.  Very nicely done.