Reflections of Dogwood by William Johnson

This poem is about the smoltering hot days between July and early September. Mowing the grass is like a treterous chore because it is just so hot. One is so annoyed, sweating, pushing along, and the neighbor's annoying mutt follows you with each row barking! I'm thinking that the author chants dogwood 3 times because when this tree sprouts back into life, the smoltering days of summer are over and the cool days of fall are back. I'm not really too sure what the writing of crucifix and the tree being nailed with bloody after bloody. But, it could be referring to the Dogwood Tree. Maybe the Dogwood tree resembles his faith and rock in times he most enjoys. Like, cooler weather in the fall.......?????If someone could help me with this one that would be great!!!