Sparky
H. 'Sparky'
The narrow leaves are green with margins of nearly-ruffled yellow, margin varies from narrow to wide and turns white. Distinct!

Alternative: H. 'Hi Ho Silver'
Plant Size
  Miniature: 6" x 18"  
Leaf
  4" x 2"; green, white margins - margins albescent  
Flower
  Purple  
Parentage
  H. 'Amy Aden' x H. pulchella  
SparkySparky