Quote Originally Posted by OngBonga View Post
No, to be honest I never considered using dust as a growing medium. I'm unconvinced that dust has good enough hydro retention to do the job.

I guess it does depend on the nature of the dust in question, though most of the dust in my house is ash.
Not to spoil your fantasy, but...

The vast majority of dust in your house is human skin cells, the mites that eat human skin cells and those mites' excretions.