Why is my variegated hosta putting out large plain leaves and what should I do?

Don't know which hosta it is, maybe it doesn't make any difference anyway. Most variegated plants are varieties of an original plain leafed version and, as such, can have a tendency to revert to plain. Cut off the plain leaves as near the roots as possible, every time they appear.

take out the green leaves when ever they show.variegated plants as mims said are man made and weeker than the origional so it will often try to revert