Pierrot's ABC Garden, Anita Lobel, Little Golden Books, 1992.
I bought this book because it was a "vintage" Little Golden Book. It was, however, from the LGB dark ages, and, therefore not one of the better offerings.
I was really liking this book until I reached the letter "U". I usually forgive lame entries for the letter "X", but it really isn't that hard to find fruits or vegetables (or plants) for the letters U, V, W, Y -- OK, maybe Z is hard, too.