Can I use broken glass as drainage in my garden?
We are in the process of building a garden at work. We have lots of cobalt glass bottles, non recyclable here, and would like to put them to good use. Can I break them and use them as drainage with rocks without any side negative affects?
everyone seems to be missing the point. i dont care about anyone’s help or injury. im worried about long term affects to the earth via the cobalt glass. the bottles should be about one foot deep in soil, dont think anyone will be hand digging that deep.

I wouldn’t. It could be dangerous to someone working in the soil.
You should care about what might happens to other people. If you don’t care, you deserve to get cut.
If you dig down a certain distance, other people are going to, too.
Aaach! Anybody working in the soil is going to get seriously injured! A deep cut with soil in it as well. No No No!
Buy a tumbler to smooth the glass out to become effectively beach glass. It will be smooth and safe to work with, just don’t use large pieces at all since when you dig you may break them and cause your garden to be full of razor edged glass.
It is a risky thing and smoothing the glass out for use in something else may be more advisable.
Why don’t you call some glass blowers in your area to see if they can use it? Those guys will buy all kinds of glass for their projects.
I would stay away from they in your garden. If you have a drainage issue, just use regular pea stone.