Circle - The circle is pre-Christian and its original symbolic meaning has been adopted by Christianity. It is universally known as the symbol of eternity and never-ending existence. Extremely common on grave sites, its usual representation is a cross surrounded by circle. Two circles, one above the other, represent earth and sky. Three interconnected circles represent the Holy Trinity.
the flowers in the circle looks like Daisy's which means innocence of child, Jesus the Infant, youth, the Son of righteousness, gentleness, purity of thought.
Wreath or Garland - The use of garlands, wreaths and festoons dates back to ancient Greek times and it was adopted into the Christian religion as a symbol of the victory of the redemption.
you could do some info look up info on the old graveyard, find the person who tends to it.