In the second stanza , we learn that the speaker is a little more than twenty years old. Of his “threescore years and ten” he will only have fifty more years to enjoy the beauty of the earth.
The third stanza explains that fifty years is really not enough time to relish the beauty of the earth, the spring, and the lovely cherry trees. Using a clever idea, he will be able to observe the cherry trees in winter as well as spring. In winter, the trees will be covered in white, but this will be snow: in spring, they are covered with the luscious white blooms, He will travel again in the woodland area to take in the beauty of the cherry trees