Michael Dahl 
Goblin in the Grass [PDF ebook] 
And Other Scary Tales

Having grown up watching her dad tend their lawn, Lisa has always wondered: where does the poison in weedkiller go after the weeds die? When Lisa has a dream one night about a monster that lives below their garden, she doesn’t think anything of it — until she goes outside sees a grass goblin and plants with teeth and horrible, gleaming eyes. Is Lisa doomed forever or will she stop the garden madness? Read this collection of scary stories to find out what happens to Lisa and many others.