▁of ▁the ▁lower ▁fuel ▁to ▁the ▁next ▁fuel ▁lad der . ▁For ▁example , ▁a ▁ ▁shr ub ▁under ▁a ▁tree ▁would ▁need ▁a ▁spacing ▁of ▁ ▁to ▁the ▁lowest ▁lim bs ▁of ▁the ▁tree . ▁Since ▁wild f ires ▁burn ▁faster ▁u ph ill ▁than ▁on ▁flat ▁land , ▁fuel ▁lad der ▁spacing ▁may ▁need ▁to ▁be ▁greater ▁for ▁s lop es . ▁ ▁Land s cape ▁use ▁The ▁term ▁def ens ible ▁space ▁in ▁landscape ▁(" f ires cape ") ▁use ▁refers ▁to ▁the ▁ ▁zone ▁surrounding ▁a ▁structure . ▁O ften ▁the ▁location ▁is ▁in ▁the ▁wild land – urban ▁interface . ▁This ▁area ▁need ▁not ▁be ▁de void ▁of ▁veget ation ▁by ▁using ▁naturally ▁fire ▁resist ive ▁plants ▁that ▁are ▁spac ed , ▁pr un ed ▁and ▁trim med , ▁and ▁ir rig ated , ▁to ▁minim ize ▁the ▁fuel ▁mass ▁available ▁to ▁ign ite ▁and ▁also ▁to ▁ham per ▁the ▁spread ▁of ▁a ▁fire . ▁ ▁The ▁first ▁ ▁is ▁the ▁" Def ens ible ▁Space ▁Zone ," ▁of ▁a ▁def ens ible ▁space ▁around ▁a ▁structure . ▁It ▁is ▁where ▁veget ation ▁is ▁kept ▁to ▁a ▁minimum ▁comb ust ible ▁mass . ▁A ▁guid eline ▁used ▁in ▁this ▁zone ▁can ▁be ▁" low , ▁lean ▁and ▁green ." ▁The ▁second ▁distance ▁of ▁, ▁is ▁the ▁" R edu ced ▁F uel ▁Zone " ▁of ▁a ▁def ens ible ▁space ▁around ▁a ▁structure . ▁In ▁this ▁area ▁of ▁the ▁def ens ible ▁space , ▁fu els / ve