European Nightcrawlers, Coco Coir and Purina Worm ChoweBayEuropean Nightcralwers 50, 100, 200, 1lb Count European Nightcrawlers (Eisenia hortensis) are 2 4 inches long and the diameter just under a #2 pencil. They can grow to be 3 8 inches long, and are 2 or 3 times bigger than most worms. The euros are certainly better for compost larger material than red wigglers. Euros can tolerate lower temperatures than other worms European nightcrawlers are excellent bait even in brackish waters. They stay on the