Garden of the Dead (1972)

Convicts on a chain gang sniff experimental formaldehyde fumes to get high. They attempt a prison break, are shot down by the guards and buried in the prison garden. Soon, they rise from the dead, using shovels and hoes to kill all who get in their way on their quest to get high once more.

Garden of the Dead is a horror movie featuring Marland Proctor.

Garden of the Dead is currently streaming for free (ad-supported) on Plex, Plex Player and Tubi TV and it's also available on Amazon Prime Video and History Vault.

It is also possible to buy Garden of the Dead on Amazon Video.