Canna lilies

I have two large Canna Lilies....Darwin and Pretoria which are too large to lift and over winter indoors, what do I do? They are planted in a gravelled area with roots under polythene sheet near to the house.....HELP PLEASE!!

 

You could try leaving them alone and once the top gets frosted, cut it down and cover with a mulch of dead leaves or similar. As its in gravel I presume you need something you can remove in the spring, straw is good if you can keep it in place.
Maybe a closhe stuffed with straw, I've been known to use those plastic bottles from water coolers with the bottom cut out.
You can then remove the straw in the spring and keep the cover in place to give them a head start.

 

thanks pete sounds like a try!

 

Betty, I have known friends who have left theirs out and they have survived without attention, however, I lost mine. I think I would be tempted to cover them with a cloche or similar if you cannot lift them.