▁received ▁less ▁maintenance ▁and ▁after ▁the ▁demol ition ▁of ▁the ▁school ▁buildings ▁in ▁ 1 9 8 4 ▁even ▁the ▁school ▁' foot print ' ▁itself ▁became ▁a ▁wood land ▁as ▁native ▁colon ising ▁trees ▁such ▁as ▁will ow , ▁bir ch , ▁and ▁al der ▁took ▁hold ▁there , ▁providing ▁however ▁a ▁site ▁for ▁the ▁unusual ▁and ▁par as it ic ▁bro om ra pe ▁( O ro ban che ▁minor ) ▁plant , ▁one ▁of ▁Scotland ' s ▁r ar est ▁plants . ▁ ▁In ▁ 2 0 1 0 , ▁N AC ▁Street scene ▁and ▁the ▁North ▁A yr shire ▁R anger ▁Service , ▁later ▁joined ▁by ▁the ▁Fri ends ▁of ▁S pi ers ▁( F o S ), ▁started ▁a ▁rest oration ▁programme ▁that ▁resulted ▁in ▁a ▁network ▁of ▁all - we ather ▁and ▁' user - friend ly ' ▁paths , ▁followed ▁by ▁a ▁survey ▁of ▁all ▁ 8 1 2 ▁trees ▁at ▁Sp ier ' s ▁and ▁the ▁removal ▁of ▁any ▁de emed ▁dangerous , ▁many ▁fel led ▁tree ▁tr unks ▁and ▁their ▁st umps ▁however ▁being ▁left ▁as ▁a ▁habitat ▁for ▁insect s , ▁fung i , ▁etc . ▁ ▁Ext ensive ▁tree ▁plant ing ▁projects ▁involving ▁schools ▁and ▁youth ▁groups ▁were ▁complement ed ▁by ▁the ▁plant ing ▁by ▁N AC ▁Street scene ▁of ▁a ▁mix ▁of ▁ex otic ▁tree ▁species , ▁together ▁with ▁trees ▁selected ▁to ▁further ▁enh ance ▁the ▁divers ity ▁of ▁the ▁Sp ier ' s ▁Ar bor et um ▁that ▁have ▁been