s ▁landing ▁some ▁distance ▁from ▁the ▁parent ▁plant ▁and ▁they ▁are ▁able ▁to ▁remain ▁d orm ant ▁in ▁the ▁soil ▁for ▁some ▁years ▁when ▁conditions ▁are ▁unf av ou rable ▁for ▁germ ination . ▁Germ ination ▁is ▁stim ulated ▁by ▁disturb ance ▁such ▁as ▁fire , ▁rain ▁or ▁season al ▁changes . ▁As ▁a ▁leg ume ▁D . ▁l ign os us ▁has ▁sym bi otic ▁nit ro gen ▁fixing ▁b acter ia ▁ ▁which ▁live ▁on ▁nod ules ▁on ▁the ▁roots ▁and ▁these ▁enh ance ▁soil ▁fert ility ▁The ▁b acter ia ▁are ▁afford ed ▁nut ri ents ▁and ▁shelter ▁by ▁the ▁planta ▁and ▁the ▁b acter ia ▁provide ▁their ▁host ▁with ▁us able ▁nit ro gen ▁collected ▁from ▁min er als ▁in ▁the ▁soil . ▁It ▁is ▁toler ant ▁of ▁salt ▁l aden ▁wind s . ▁ ▁H ort icult ure ▁D ip og on ▁l ign os us ▁has ▁been ▁widely ▁cultiv ated ▁outside ▁of ▁South ▁Africa ▁from ▁as ▁far ▁back ▁as ▁the ▁early ▁nin ete enth ▁century . ▁Are as ▁where ▁it ▁has ▁been ▁used ▁in ▁h ort icult ure ▁include ▁Europe , ▁Made ira , ▁Az ores , ▁Sri ▁L anka , ▁Australia , ▁California ▁and ▁temper ate ▁regions ▁of ▁South ▁America . ▁ ▁In vas ion ▁D ip og on ▁l ign os us ▁is ▁regarded ▁as ▁highly ▁invas ive ▁in ▁Australia ▁especially ▁in ▁rivers ide ▁and ▁coast al ▁veget ation , ▁he ath land , ▁dry ▁s cler oph yll ▁forest , ▁warm ▁temper ate ▁rain