block

[The Mad Poet]

I can vouch for 'cage carpet', the anti-astroturf, as I used it for several years. Though not necessarily cheap, I found this to be a fantastic substrate. Don't know if you'll have a different experience, but whatever brand it was I had originally bought served very well for many years without fraying, staining, molding, or otherwise posing health issues. Also, it stayed very pretty and green.