It DOES need a rest (dormancy) in winter. It's not hardy in Zone 3. If you have a cool basement or unheated garage where you can keep it around 35-40F for the next 3-4 months that would be good. Mine go in the fridge after I cut down the pitchers and put them in zip lock bags.

Leucophylla does produce several lance shape pitcherless leaves called phyllodia leaves during the summer & again during the approaching winter dormancy.

So the reason your plants stopped growing is that they are now dormant.

Follow the above advice.

Thank you both for the quick response. I thought they needed dormancy, but was told otherwise. It'll go into the basement c the other dormant plants (corms).