bor et um ' s ▁trees . ▁The ▁Kle hm ▁family ▁purchased ▁the ▁nur ser y ▁in ▁ 1 9 6 8 ▁and ▁maintained ▁it ▁until ▁ 1 9 8 5 , ▁when ▁they ▁don ated ▁the ▁property ▁to ▁the ▁Win ne b ago ▁County ▁Forest ▁Pres erve ▁District ▁as ▁an ▁ar bor et um . ▁In ▁the ▁early ▁ 1 9 9 0 s , ▁the ▁site ▁was ▁invent or ied , ▁a ▁master ▁plan ▁developed , ▁and ▁a ▁capital ▁campaign ▁undert aken . ▁Garden ▁plant ings ▁began ▁in ▁ 1 9 9 4 . ▁ ▁The ▁ar bor et um ▁includes ▁a ▁pre - sett lement ▁Bur ▁Oak ▁gro ve ▁( 5 ▁ha ▁/ ▁ 1 2 ▁acres ) ▁whose ▁largest ▁trees ▁are ▁estimated ▁to ▁be ▁over ▁ 3 0 0 ▁years ▁old . ▁It ▁also ▁includes ▁over ▁ 5 0 ▁species ▁and ▁cultiv ars ▁of ▁Con if ers , ▁representing ▁nine ▁groups ▁from ▁North ▁America , ▁Europe , ▁and ▁Asia , ▁such ▁as ▁F irs , ▁Jun ip ers , ▁Spr u ces , ▁P ines , ▁Douglas ▁Fir , ▁Y ew s , ▁Ar bor v ita e , ▁Hem lock , ▁Nik ko ▁F irs , ▁Meyer ' s ▁Spr uce , ▁Common ▁Juni per , ▁Ar bor v ita e , ▁and ▁the ▁Thread leaf ▁S aw ara ▁False cy press . ▁▁ ▁The ▁European ▁collection ▁includes ▁m ature ▁Norway ▁Map le , ▁Field ▁Map le , ▁Ped un cul ate ▁Oak , ▁English ▁El m ,