Mine do the same thing, I have them in a window that gets plenty of sunlight. I think the problem with mine during the winter is that it is cold in the window. It hasn't really bothered me since I know their growth will pick back up in the spring. I know that doesn't answer your question...

It is cooler in the window, and lower photo period, Try giving it a little bit more water and Fertalize them, it might help with the growth.

Cheers

The simple and cheaper solution is to buy a bigger light bulb.

Mine (Ventrata, Sanguinea, Sibuyanensis along with sundews and untimely purchased VFTs) sit under a 45 Watt, compact flourescent lamp and grow very well, producing large and colourful pitchers all through the Winter. The humidity ranges from 40-70% and temp ranges from 63-72F but they don't seem to mind.

It would be a lot cheaper to buy a bigger lamp/bulb and the difference will be astonishing without the hassle of building a greenhouse.

Cheers

Kyle

Generally speaking, Neps come from where the seasonal differences are almost negligible, and certainly far less cyclical than that of America. Also, their temps are more like that of our summers than that of our winters. Basically, they need warm, moist, fairly lit environments. We may do well by them from spring through fall, but winter requires a bit of help - like artificial lighting and and warmer temps. I haven't been able to provide artifial lighting and mine, which are in a planter by a window sill, either stop or slow down pitcher production.

I just accept that most of my Neps will stop pitchering and will lose pitchers every winter. I have space for a few of my smallest Neps beneath the shoplight that's my orchids's winter home. Most of those hold their pitchers and grow new ones. But there's no simple way to provide more than window light for the big Neps. I prefer having more Neps living in mediocre winter conditions than to just have a few in excellent conditions.

That's neither herenorthere! Yeah, I do the same and basically put up with the winter blahs for a few months.

Thanks guys, I think I will just get some lights and hang them like shop light...How far underneath the lights do the plants have to be? Like no less than a foot right?

I've been growing mine under a 400 watt metal halide lighting sysytem and have had excellent luck for the most part , but am still planning on putting a a small green house this summer. Plants are simply overtaking my poor houe! LOL Lots of Luck !

I was just thinking about a greenhouse myself today. I dont really have a need for a real big greenhouse though . I was considering using some plastic shelves that I bought from a hardware store and covering them with heavy clear plastic. Does anyone else think this might be a good idea . Just throwing it out there for an idea to make a cheap greenhouse with items that we already have laying around.