This cultivar is an upright growing, giant size hosta with heavily corrugated, dark blue-green leaves. It is a non-registered cultivar originated by David Parks of Massachusetts and is a hybrid of H. 'Frances Williams' × (probably) H. 'Blue Angel'. The flowers are near-white in color. 

The plant is named for one of David's daughters.
 

Warren I. Pollock wrote an article about H. 'Betsy' in The Hosta Journal (2012 Vol. 43 No. 2). He quoted a message from Rick Goodenough, "H. 'Betsy' is out of 'Frances Williams' (F. Williams - 1986) and the pollen donor is believed to be 'Blue Angel' (P. Aden -1986)...H. 'Betsy' is unique in that it is one of the largest blue hostas known and has a nice clumping form. It is a giant. Beautiful near-white bloom peek out of the top of the clump on scapes that do not attempt to overshadow the rest of the plant." David Parks added, "H. 'Betsy was named for our daughter."