Bees and butterflies are crossing the wall one after another, but they suspect that spring is in the neighboring house.
Obviously these are the two sentences. The first two sentences describe the scenery of flower petals being knocked off after rain, while the last two sentences show another scene, that of bees and butterflies, and then It evoked a connection with the author.
This poem expresses the author's optimistic attitude. The petals here are gone, but there are still them next door.