Overwinter Erysimum varigate leaf, orange flower

Oh dear - if it's an annual, it's likely to die back when it has finished flowering. I can't find any reference to the latin name in my RHS book. I know that there are some annual varieties, but there are also biennial and perennials. I have a wonderful apricot coloured perennial Erysimum which has been in flower for months. Why not keep yours for as long as you can, then look for the perennial one for your garden? I know it hasn't got variegated leaves, but it has been a joy in the border - it's still in flower now. Its name is E. 'Apricot Delight'. If you go to my page and to 'my garden' you can find two photos of it under its name. Click on the photo that is showing to find the second one. I think it's on page 4 of my plants.