TYVM I assume this is the version recorded by Sandy Paton. Lizzie was so taken by the ballad she went to the Craigston Castle. I still don't have her source but I though it might be Stanley Robertson.

Steve- I finally got the text to the Wehman Broadside, dated about 1880. It is broadside No. 756 by H. J. Wehman of 50 Chatham St., New York, which was the first version published in the US. The text was reprinted in Good Old-time Songs, Issue 3 by Wehman bros., firm, publishers; 1914:

MY BONNY BOY IS YOUNG, BUT HE'S GROWING

Oh! father, dear father, you've done me much harm.
You've married me a man that is twice too young;
I'm twice twelve and he is but thirteen.
He's young but he's daily growing.

Oh! daughter, dear daughter, I've done you no harm,
I've married you to a rich man's son;
He'll make you a lady if you wait on,
He's young but he's daily growing.

Oh! father, dear father, if you think it fit,
We will send him to college for one year yet;
We will tie a green ribbon around about his head
To let the pretty girls know he's married.

As she chanced to look over her father's garden wall,
'Twas there she saw some men at the tossing of a ball.
Saying, my own true lover is the fairest of them all,
He's young but he's daily growing.

She bought him a shirt of the cambric so fine,
And stitched it all 'round to suit her mind;
As site sat a sewing, the tears came rolling down,
Said she, my bonny boy's a long time growing,

At thirteen he was a married man,
At fourteen his young babe was born.
At fifteen his grave it was green.
And that put an end to his growing.

Any other versions? I'm finishing up the US versions and have improved my headnotes here:
http://www.bluegrassmessengers.com/5-a-growing-the-trees-they-do-grow-high.aspx

Richie