I am afraid I am going to have to throw out some guesses here. I do not recall the song. However, Rediscover Music has a catalog with 17-18 Glen Yarbrough albums. Looking throught the titles and trying to put context to the 2 lines listed, I will suggest the following in hopes someone's memory will be joggled.

Rose, Me & My Dog (Live at the Hungry I)

When Summer Ends (Come Share My Life)

I'm Strong But I Like Roses (GY Sings Rod McKuen)

The Summer's Long (LIve at the Hungry I)

good luck

rich r