I am pretty sure it was Armageddon, I remember there were also rules for foghting in the Ash wastes. There was a table to role on if a unit entered an ash pile to see what happened. It was for plants that lived in the wastes, not the jungles.
It could have been from Apocalypse 2nd edition, but I think it was earlier- perhaps as a pdf on the old
GW website before all the old hobby stuff got nuked when switching to the new webstore.
Automatically Appended Next Post: The_Real_Chris wrote:In the Guardsmen's Imperial primer Armageddon edition they had the revised guide that made it clear not to follow earlier instructions and avoid most of the plants...
This matches- all the plants with rules could hurt your units.
Automatically Appended Next Post: Found it! Was in the Apocalypse rulebook (second edition), specifically within the Armageddon warzone. Why you would want rules for individual plants clogging up an Apocalypse battle I do not know...
There is also stuff for ash wastes and the Season of Fire.
I am increasingly of the opinion that no one else read this warzone- even Lexicanum is very light on the lore additions from it