I do not believe the poem itself contains ironic elements. It's a poem about nature going on its business whether or not humans are there or not. If anything, I would describe the poem as being a good illustration of naturalism. However, when Ray Bradbury used that poem alongside his story by the same title, the poem becomes much more ironic. The poem itself points to nature's ambivalence about the presence of humanity, but Bradbury's fictional house expresses the same kind of ambivalence to humans as well. Despite the fact that the house was supposed to exist to meet every beck and call of humanity, it carries on just fine without any people in the house at all. Both Teasedale's nature and Bradbury's technology show that they are just fine without people in the picture.