The only way for these 2 poisons to be completely revived is to leave the remaining locs above 2, then replant any exess into new locs.
Make sure any and ALL picking is followed by planting, or we only get increasingly smaller numbers. if someone thinks it is a smart idea to clearpick the resik (if it wasnt root rot), think again - they are a great source of attack for poison pickers, and all you need to do is figure out when to pick them.
That said, everyone put in a big effort to repopulate the 30-odd marsh locs, for it shall benefit us all.
Written by my hand on the 5th of Eleuthral, in the year 1132.