posted 2 years ago
We are lucky enough to have a large, healthy earthworm population which I put down to a relatively high levels of organic matter in our soil. Another factor, perhaps, is that our land hasn't been tilled or sprayed for many years, if ever. It has been grazed, and I suspect the sheep were given worming medication on occasion, but not since we took possession a couple of years ago.
This aside, we commonly find large numbers of earthworms beneath the layers of leaf litter that drop in the autumn/fall. The leaves form a wet mat on top of the turf and, at the intersection between the leaves and the soil, there are often tens of worms busy digesting the leaves.
We also have a lot of log piles dotted around from various felling work we have needed to do. Some of this wood is ash, a species that sheds its bark quite easily, and underneath the bark there are often many composting worms which I spot as I move or process the logs (for firewood) and the bark peels away. This is also a rich habitat for centipedes and woodlice.
As others have suggested, compost heaps will attract large numbers of composting worms (red wrigglers/brandlings) and will give you a yield for your efforts. Incorporating this into your soil will improve the earthworm population as one of the food sources for earthworms is composting worm castings (which will be present in your compost).
Aside from that, I would say leave piles of leaf litter, woodchips and logs dotted around your garden. You can stack these neatly so that they look intentional, rather than neglectful. I know of some who create a tall cylinder from chicken/fencing wire and fill it with leaves in the autumn; this looks quite architectural and no doubt provides a wonderful home for many creatures.
Small-holding, coppice and grassland management on a 16-acre site.