There may be a 20-foot-tall skeleton on your next-door neighbor’s lawn and zombies in the yard across the street, but the real horrors often lie in unmarked graves in the gardens of those you least suspect — maybe even your own.

I’ll be the first to admit there have been a few frights in my garden over the years, starting with the English ivy and pea-gravel mulch I inherited when I moved into the house and ending with the mint I foolishly planted directly in the ground many years ago, when I didn’t realize it would still be around to haunt me today.

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