ritual plants of muslim grave yards

throught my research i have found that the use of plants for ritual in muslim grabeyards is very important.
i found 'Plants were used to mark rites of passage both in human and in the annual cycle, as well as to decorate and to symbolize [[1]:262]. Plants, especially flowers, have been used at funerals in many cultures [[1]:66–70; [2]:165–167; [3]: 3–5]. Folkard [[4]:193] wrote, "All nations at different periods seem to have delighted to deck the graves of their departed relatives with garlands of flowers. The association of certain trees and plants with death and its glooming surrounding dates from a period remote and shadowy in its activity".'
white flowers are used as a symbol of purity and right of passege into the afterlife.