I don't know if Whippoorwill (1997) is still around, but "The Berry Tree" was definitely the theme song from the 1955 movie "Many Rivers To Cross" with Robert Taylor as "Bushrod Gentry" and Eleanor Parker as the spunky "Mary Stuart Cherne".

Does anyone know if it is the same "The Berry Tree" song that charted (CashBox) in 1955 by Bill Hayes (the same year he charted with "The Ballad of Davy Crockett")? Seems like a coincidence, if not. I have not been able to find it on CD or Cassette tape. No one was credited with the theme vocal although Cyril J. Mockridge was credited for the soundtrack music. Even though it has some of the same lyrics as "Blue-Eyed Gal" and others, it has a very different melody. Below is what I posted on IMDb about the song and movie about a year ago:

I have been searching for the theme song of this movie "The Berry Tree" since I saw it once as a 6-year-old kid in 1955 or 56. I've hummed the melody and sung the few lyrics I remembered since then. I finally got the VHS tape last week (from videorarities.net) and what a pleasure. This is a fantastic frontier comedy and it brings back fond memories of me as a young kid wearing a Davy Crockett coonskin cap and singing the song. Here are the lyrics to the song if anyone else has wondered what they were for 45 years or so, as I had. From other comments here, this song made an indelible impression on almost everyone that has heard it.

The higher up the berry tree the sweeter grows the berry
The more you hug and kiss a gal the more she wants to marry
The berry tree's a wise old tree the sweetest fruit is his'n
But marryin' up with any gal is just like goin' to prison

(Bridge)

Peaches in the summertime, apples in the fall
Till I find the gal I want, a-gonna have none at all

Cause higher up....

Cruiser