I have a Sarracenia in the swamp bucket in the garden, Sarracenia are somewhat winter hardy dies off from frost but it comes back every year and actualy they need a dormancy periode.
You wont recognize it as a Sarracenia, but it definitively is one it not yet developped any trumpets.
There are a few tropical sundews which don't need dormancy, the south african is the most common, others are extremely difficult to keep. Had a few tropical pygmaea sundews and both didn't survive repotting. Also tried them above an open top tank but no succes.. Most easy to keep carnivorous are seasonal available at most garden centres, i guess this is about the time they have them till the fall.
This dormancy is difficult to describe how a plant goes through it.. Some people are succesfull with getting them through the winter with just a resting periode where they do not grow and also not die. And in other cases they just wither completely away and might come back in the spring if the rootstock didn't rot mean time. It's a lot of trail and error.. Best way to get them through the winter periode is putting them in a cold +/- 10°C inveronment with sufficient light.
So keeping them all year long above a tropical indoor tank? Might work, might not, most likely not.. I guess that's why we do not often see them around.
Actualy few weeks ago i snatched a few very tiny few mm big baby shoots from the plant in the swamp bucket above and put it in some moss above the indoor low tech..
In here
Still to soon to say what it will do, only one large enough to get a picture of it is this one in the liver moss. Still green, grew a bit.. But it goes so slowly i have no idea what it will do before it goes winter again. It's a piece of spider wood, Already strugling from the start to get mosses to grow to this type of wood.. I guess it's to hard and way to fresh. Dunno yet if i have any succes with the sarracenia..
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http://www.sarracenia.com/faq.html