Is it possible?

Was just on the local hydro shops website, clicked growing mediums and soil, hydroponics, and earthworm casting came up..is yet possible to grow in just earthworm castings? I thought it would be a bit to nitrogen rich right?

NO!!!!!

Not because of the N either. EWC is usually kept at 20% or so of the mix because it is so heavy and turns to sludge when wet. It won't burn anything.

Wet