ide ▁( PT C ), ▁which ▁is ▁either ▁bitter ▁or ▁t ast eless ▁to ▁people ▁depending ▁on ▁their ▁taste ▁bud s . ▁ ▁Us es ▁ ▁Food ▁ ▁Al most ▁all ▁parts ▁of ▁some ▁species ▁or ▁other ▁have ▁been ▁developed ▁for ▁food , ▁including ▁the ▁root ▁( rut ab aga , ▁turn ip ), ▁st ems ▁( k ohl rab i ), ▁leaves ▁( c abb age , ▁coll ard ▁gre ens , ▁k ale ), ▁flowers ▁( ca ul if lower , ▁bro cc oli ), ▁bud s ▁( Br uss els ▁spr outs , ▁cab bage ), ▁and ▁se eds ▁( many , ▁including ▁must ard ▁seed , ▁and ▁oil - produ cing ▁rap ese ed ). ▁Some ▁forms ▁with ▁white ▁or ▁pur ple ▁fol i age ▁or ▁flower head s ▁are ▁also ▁sometimes ▁grown ▁for ▁orn ament . ▁ ▁Br ass ica ▁species ▁are ▁sometimes ▁used ▁as ▁food ▁plants ▁by ▁the ▁lar va e ▁of ▁a ▁number ▁of ▁Le pid optera ▁species — see ▁List ▁of ▁Le pid optera ▁that ▁feed ▁on ▁Br ass ica . ▁ ▁N ut r ition ▁▁ ▁Br ass ica ▁veget ables ▁provide ▁high ▁amounts ▁of ▁vit amin ▁C , ▁vit amin ▁K , ▁mang an ese , ▁and ▁sol ub le ▁fi ber , ▁and ▁contain ▁gl uc os in ol ates ▁which ▁are ▁under ▁pre lim inary ▁research ▁for ▁their ▁potential ▁bi ological ▁properties ▁when ▁consum ed . ▁ ▁Ep ide mi ological ▁studies ▁suggest ▁that ▁br ass ica ▁veget ables ▁are ▁protect