Gardening & Landscaping
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do egg shells EVER break down?

I have always put them in my compost and when i turn the compost over everything is all nice and earthy excepte egg shells.  Last year I put shovels of mostly broken down compost in to the bottom of planters then in the fall dumped them in to a pile in my garden. They are still recognizable egg shells that are going on 1.5 years i'd say?

And why is it egg shells are ok to compost anyway seeing as they aren't plant based?

I just dried out a bunch from brunch on sunday and crushed them up before I put them in the compost but that seemed like more work than I feel like doing regularly.  I am wondering if they are even worth it anymore.

Re: do egg shells EVER break down?

  • I don't think they compost quickly, but they're great in gardens.  Keep slugs away and all that.
  • I always microwave my empty shells for about 10 seconds per egg then crumble them before putting them in the compost and they seem to break down quicker.
  • I also do the microwave/smash thing and the shells disappear in the compost pile.

    Egg shells add calcium, a required micronutrient, to your compost.

    image
  • It doesn't really matter if they disappear in the compost. As long as they get broken up a bit when you turn and move the compost, they add calcium to the soil. Keep throwing them in there!
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