That’s a bit misleading. not all earthworms are invasive. approx 1/3 of earthworm taxa are invasive non natives. since they outcompete natives, there are larger populations of invasives vs natives. jumping worms are the most recent invasives to establish themselves in my area. while invasives can cause damage to ecosystems by disrupting nutrient flow/mycorrhizae, once established there is nothing that can be done to remove them from the ecosystem that won’t disrupt native populations too. while everything should be done to prevent the spread of invasive species into new ecosystems, sheet mulching to attract all decomposers, native and non native, isn’t going to cause any more harm than those non native earthworms have already caused to that ecosystem.
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As mentioned we reuse old cardboard from packaging items are delivered in. After the growing season it is mostly broke down but any remaining becomes worm food in the compost pile. Ruth stout used old hay but no matter what you use tilling is not necessary unless their is severe compaction.
The old books are inspiring gardening material
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