Shakespeare Sonnet 12

Sonnet 12 is still carrying the theme of convincing the boy to procreate.  This particular sonnet seems to definitely use a lot of words from nature which is really not all that uncommon for Shakespeare.  The first and second quatrain are talking about the world around him growing old and plants dying and so on.  At line 9 it shifts to specifically the man in subject and how his aging is inevitable.  The only way to fight "Time's scythe" as stated in the couplet is to have children before this personified Time takes you away.  The young man will be missing his opportunity for immortality if he doesn't act soon.  With all the emphasis and effort Shakespeare must have put into these, it's incredible to think the boy wouldn't have heeded his advice by now!