Fans who follow the extended material around 'Harry Potter' know that the books themselves never specify exactly where Astoria Greengrass was laid to rest. I like to be precise: canonically her death is acknowledged in the stage script of 'Harry Potter and the Cursed Child' and J.K. Rowling expanded a little on her life on 'Pottermore', mentioning the tragic blood-related condition that shortened her life. Beyond that, there’s no passage in the original seven books or the play that gives a graveyard name, coordinates, or a moving description of her funeral.
Because the texts are silent, a lot of the conversation lands on reasonable inference. The Malfoys are an old, private family with Malfoy Manor as their ancestral seat in the English countryside, so it makes practical sense that Astoria would be buried on family land or in a private family plot. In the wizarding world we see nobility keeping private grounds and personal memorials rather than public cemeteries, and Draco’s grief in the play suggests a private, intimate burial rather than a public ceremony — something quiet, guarded, and shielded from sight.
I've always imagined her small gravesite near a hedge or laurel on the Malfoy estate, tended by a house-elf or by Draco himself in later years — a place Scorpius could visit in secret. Fans draw comfort from that image: a hush of green, a simple marker, a few wildflowers. That private picture fits their family's privacy and the softer, quieter way Astoria is represented, and I find it quietly fitting for her character.