Can I use pine cones to pay homage to the grave?

Of course.

People usually plant pine trees next to cemeteries. The ancients generally believed in pine trees, which were tall and straight and had a very beautiful meaning.

Pine trees and pine trees were planted on the graves of the dead to protect a monster named raccoon, which feeds on human corpses.

People usually plant pine trees next to the cemetery, because pine trees represent, well, ancient people generally believe that pine trees are tall and straight, which has a very good meaning.