▁virt ually ▁p est ▁and ▁disease ▁free . ▁If ▁grown ▁properly , ▁D . ▁po etic um ▁will ▁gradually ▁spread ▁and ▁colon ize ▁from ▁self - se eding . ▁ ▁Notes ▁ ▁References ▁▁ ▁Category : Prim ul aceae ▁Category : End em ic ▁fl ora ▁of ▁the ▁United ▁States ▁Category : Fl ora ▁of ▁Oregon ▁Category : Fl ora ▁of ▁Washington ▁( state ) <0x0A> </s> ▁L una ▁ 1 4 ▁( E - 6 LS ▁series ) ▁was ▁an ▁un mann ed ▁space ▁mission ▁of ▁the ▁L una ▁program ▁run ▁by ▁the ▁Soviet ▁Union . ▁It ▁was ▁also ▁called ▁L un ik ▁ 1 4 . ▁ ▁Over view ▁The ▁space craft ▁is ▁believed ▁to ▁have ▁been ▁similar ▁to ▁L una ▁ 1 2 ▁and ▁the ▁instrument ation ▁was ▁similar ▁to ▁that ▁carried ▁by ▁L una ▁ 1 0 . ▁It ▁provided ▁data ▁for ▁studies ▁of ▁the ▁interaction ▁of ▁the ▁Earth ▁and ▁lun ar ▁masses , ▁the ▁lun ar ▁gravit ational ▁field , ▁the ▁propag ation ▁and ▁stability ▁of ▁radio ▁communic ations ▁to ▁the ▁space craft ▁at ▁different ▁orb ital ▁positions , ▁solar ▁charged ▁particles ▁and ▁cos mic ▁ray s , ▁and ▁the ▁motion ▁of ▁the ▁Moon . ▁This ▁flight ▁was ▁the ▁final ▁flight ▁of ▁the ▁second ▁generation ▁of ▁the ▁L una ▁series . ▁ ▁L una ▁ 1 4 ▁successfully ▁entered ▁lun ar ▁orbit ▁at ▁ 1 9 : 2 5 ▁U T ▁on ▁ 1 0 ▁April ▁ 1 9 6 8 . ▁Initial ▁orb ital ▁parameters ▁were ▁