Halo
H. 'Halo'
Leaf margins get brighter, turning gold in summer

Alternative: H. 'Unforgettable'
Plant Size
  Medium: 18" x 50"  
Leaf
  10" x 8"; chartreuse, yellow margins - margins lutescent  
Flower
  Pale lavender  
Parentage
  H. 'Flamboyant' x h. 'Estelle Aden'  
Images to follow
In the meantime check out the Hosta Library