The girl is impressed by his apparent concern for "green" issues (planting a tree). This is an irregular construction in (American) English. ," is "Love is Blue," from the famous song by that name.
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The girl is impressed by his apparent concern for "green" issues (planting a tree). This is an irregular construction in (American) English. The only other phrase containing a color and starting with "Love is...," is "Love is Blue," from the famous song by that name.