The back vent is 36 feet long and the honeycomb is 4 feet tall I believe. I have fought for many years to keep the aroids out if it. It is the PERFECT substrate for vining plants like Monstera, some Anthuria and climbing Philodendrons to want to root in. But I think they would cause it to decompose rather quickly. Right now there is ONE that I can't remove (I could, but don't want to disturb it), a Monstera deliciosa aurea-variegata.