Beneficial Nematodes

The Home Depot product description: (bold = my emphasis added)

Beneficial Nematodes are microscopic warriors that kill soil borne pests such as flea larvae, spidermites, fungus gnat, weevils, grubs, rootworms, cutworms, and many more. These Nematodes search, find, and kill pests living in the soil. They are extremely effective, and will reproduce and spread to provide you with long lasting organic pest control.

• Economical
• Effective! (<- their !, not mine)
• Fun for the garden
• Natural
• MFG Model # : 361
• MFG Part # : 361
• ADA Compliant : Yes (American Dental, Diabetes, Dietetic Association or Americans with Disabilities Act?)
• Assembled Depth (In Inches) : 6 In.
• Assembled Height (In Inches) : 4 In.
• Assembled Weight (In LBS) : 1
• Assembled Width (In Inches) : 4 In.
• Indoor or Outdoor : Outdoor
• Longevity : 12 months
• Stains : No