What to do with Ismene Festalis after flowering please?

[alp]

I have numerous Ismene Festalis and now some has shed their blades and some are still verdantly adorned with their blades of glory.

What should I do with them now please?

Suggestions appreciated. Thank you in advance.

 

[Verdun]

Allow to die down naturally but lift before temps get too low. Keep frost free and dry until early spring.
You could fleece them or wrap in paper or even polysterene chips if you have enough

 

[alp]

Will do that, @Verdun

Thank you so much!