There are so many sanctuaries in the realm already I hardly think we need more, just politely ask (read as: attacklock) your participants not to fight during seedwalks, and one or two hit and runs won't hurt too bad, could even spawn an impromptu many-vs-one situation, which could be fun and interesting.
Also wouldn't it mess things up on Old Man's Road, with the NPC battle?
Also to counter your argument, Awiiya's roots don't spread far enough because his leaves have been gone for so long, they don't have enough energy.