The Little Rose Tree by Rachel Field Flower poem

Every rose on the little tree
Is making a different face at me!
Some look surprised when I pass by,
And others droop — but they are shy.
These two whose heads together press
Tell secrets I could never guess.
Some have their heads thrown back to sing,
And all the buds are listening.
I wonder if the gardener knows,
Or if he calls each just a rose?