cabbage patch where cabbages are human heads?

Am new to this forum and would love help finding a movie. I unfortunately only saw part of it on tv few years ago (may have been scifi channel). I remember a fenced in backyard? someone climbs over the fence to discover what looks like a cabbage patch, think the "cabbages" were covered in cloth. when they uncover the "cabbage" turns out to be moving human head? would really appreciate the help. thanks!