Edit Ive been told these could be either Earthworm hatchlings, Potworms from Fungus Gnats or Jumping worms commonly found in potting soil. We are told most likely the Potworms from Fungus Gnats , We Planter Pots Made From Recycled Materials Kanso Designs How and When to Sow Wildflower Seeds BBC Gardeners World Magazine How to Grow Purple Passion Fruit vs. Maypops: The Ultimate Guide ~ Homestead and Chill Crystal Clear Aroid Pots Prevent Root Spiraling with Superior Airflow PlantScraper The Complete Guide to Planting in Large Planters Pots Planters & More