I live in a coastal rain forest. The native flora here doesn't just grow, it explodes. One day it is neatly cut back, a month later it has intruded two feet into my clear space. We have a "Green Belt" between residences here of 10', but I keep things pretty well trimmed to that "Border". I have a plan for placing deterrents into the Green Belt, but cannot implement that until a SHTF event occurs. There is only twenty feet between my home and the Green Belt behind me. Not much of a warning that folks are scouting us out or about to attack the house, thus the well placed impediments. What are you doing, or better... Do you have 20 to 30 yards of visibility, a fence, or in BT's case... A Brown Bear and Miles of Alaskan Wilderness?