oats peas beans and barley grow
oats peas beans and barley grow
neither you nor i nor anyone knows
how oats peas beans and barley grow


or

inch by inch row by row...by David Mallet..
it can be found in teh D.T. (look in search box)

the Banana Slug String Band has a whole song book
of "earthy" songs....including "Dirt made My Lunch"
which explains growing cycles, etc.
their songs are written by Steve Van Zandt