What does the poem of willow and ginkgo by eve merriam mean ? if you answer you will get the 20 points

The author is comparing the Willow tree to the Ginkgo tree. She talks about how each one is and how she likes both of them.  She describes the good qualities of them.  At the end, she means, even though the willow is beautiful, the ginkgo is truly the better tree because you have to look on the inside not the outside.