Of about 1,800 species of earthworm in North America, none are native to Southcentral Alaska.
Our back lawn looks like a football team ran across it in cleats, bringing up bits of rich, dark soil that slowly fade into the grass as it rains or they get stepped on. I couldn’t be happier.You undoubtedly have experienced earthworms of late and maybe even their castings. I know I am getting lots of questions about those lumps of soil all over lawns.
What earthworms we see in our yards and gardens and on driveways and sidewalks are all imported. One paper on the subject of earthworms in Alaska noted 14 kinds of imported earthworms. These were let loose in our gardens and yards either purposely or because they came up in a potted plant or bag of soil and escaped in the spring or summer. Some come up the road system as eggs in cocoons, which are deposited and then hatch in the spring.
Anyhow, the earthworms we see after a rain and the ones that create that wonderful soil are invasive. We love them because they only want the invisible microbes on the leaf litter and duff they ingest, leaving us with “poop” that has 500% more nitrogen, 700% more phosphorous and 1,200% more calcium than the surrounding soil. Now you know why they are so valuable in the garden.
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