FWIW.
Other cases where a woman has buried a man in the garden.
Pushing up the daisies: Body of dead woman's husband found buried under the garden she lovingly tended to for years | Daily Mail Online
''Her neighbours thought that she was just another crazy old lady who enjoyed talking to her flowers while she lovingly tended her garden at her North Carolina home.
They had no idea she was actually chatting to her dead husband who was pushing up daisies under the concrete.
Ruth Huber Bostic, originally from New York, was said to have carefully tended to her flower garden every day, even though the rest of her home and property were in shambles''
Aaron Pajich: Women charged with murder of teenager found buried in backyard appear in court - ABC News
''Jemma Victoria Lilley, 25, and Trudi Clare Lenon, 42, were charged after police found the body of Aaron Pajich under a freshly laid concrete slab in the backyard of their home on Broughton Way in Orelia''