s. ayalp wrote:Please don't leave them. Whatever you bury will eventually come back to the surface and become a hazard. Instead of corroding away some of those nails will corrode into very long, thin and very sharp shapes. Those are a lovely invitation to some nasty cuts and, at worst, to tetanus. Instead of burying, you can burn that pile and use the ash in the garden. It will be very easy to remove nails and metals from it by a magnet.
Jan White wrote:You've got a wide range of materials in your beds, probably lots of fungi and microbes, so this might not be an issue for you, but those ferns you're using look like bracken. Bracken has ptaquiloside which has allelopathic effects on other plants. It's a very tough plant. The ptaquiloside is released from rhizomes, stems, and leaves as they break down. Three years in, there are still some plants that just will not grow in our soil where bracken was cleared - mostly root crops and ornamental bulbs. Fruiting plants like tomatoes and squash were fine right from the start. Our irises struggled on pathetically and this year started to look okay. Our soil is extremely poor to begin with, so you may not have any problems. I'd go easy with it though :)