The rose garden represents many things, here is an excerpt from the enotes:
The fact that Death appears in the rose garden underscores the place of death in the order of the natural world. He not only encounters the Gardener there but the Master as well, emphasizing that death’s dominion is nature itself. A rose garden is a place of great beauty, but that beauty is seasonal. When the season changes, the roses wither and die. So, too, with human beings.
Another metaphoric meaning could be like the 3 parts to a rose the petals, the bud, and the thorns.
The rose shows beauty and holds the bud- signifying new life. The thorns show death and destrusction.
I beleive that the Donald Justice is trying to tell us that death is nothing to fear, escpecially because he in the poem he voices through Death "I knew your father, we were friends at the end" He is trying to tell you that death is there to lead you through your demise and also brings forth new light and life.
:) Just thought another opinion could help.
Hello, my friend!! Thank you for your question!!
There is an allegory in the use of roses, which signify a juxtaposition of two extremes, in the sense that roses are the ultimate flower which everybody could long to get and are the ones to be offered to our beloved. They can unexpectedly prick you because of the thorns, hidden underneath the petals. They look approachable and make you want to touch them but this is a deception-such as Death. They can cause harm. So does Death-he can be found where he is least expected, even approaching people in a provocative way, as in the "incident..." but he is the one to have the final word. ;-)