Kat- Sorry, I intended to respond to your cardboard question. I use newspaper as a weed barrior, covered with compost for mulch. I do not find any particular increase in earwigs, etc. as long as I also make sure there is good air circulation within the garden.

Cardboard can been used in a similar way. In our case, the voles love to make their runways under cardboard so we don't use it. Voles are responsible for a great deal of plant damage in this part of Maine.

When I have used woodchips as mulch I have seen an increase in slugs, snails, and earwigs. A lot depends upon the local soil, moisture, and so on. Have you contacted the Cooperative Extension in your area? They should have sound advice for you.

maeve