It’s worm time! Heralded by the coming and going of the full worm moon on the 28th, earthworms around the northern hemisphere are enjoying the warming soil and are making their way to the surface. Colorado has no native species of earthworm, but 14 different species have been introduced from Europe and Asia. These worms have a mixed effect on the Colorado ecosystem: While they are effective at breaking up clay and hard soil to loosen it for plant roots, they can also deplete nutrient levels and prevent…