to have a devils garden is to have a vagina with genital warts. A Devil's Garden was a small boxed in minefield used in desert warfare. There is about 17 million unexploded anti-personnel/anti-tank mines, artillery shells, bombs dropped by aircraft, machine gun, small arms, and mortar rounds that still remain beneath the sand in europe.
"dude, that chick has a devil's garden", "Promote abstinance to keep people from having a devil's garden" (like that works)
Joe had his legs blow off when he accidentally walked into the Devil’s Garden.