Katherine Warington
Katherine Warington ( 5 September 1897 – 3 July 1993 ) was a botanist and the first person to show that boron , as boric acid , was essential for the healthy growth of plants . 
<triplet> Katherine Warington <subj> 5 September 1897 <obj> date of birth <subj> 3 July 1993 <obj> date of death