A lot of the growers of the terrestrial Utrics do not know enough to tell the differences between the weedy ones and many species are being traded/sold but are actually just an invasive one that took over the original pot. I've had to break the bad news to move than a few over the years. There are a few threads here about mis-ided Utric's that were traded around and later found to be an invasion similar version when they finally flowered or found there way into the more informed growers hands. I still have a few Utrics I received under difference names that are clearly not that plant and I'm waiting on a flower to get an ID, if I ever get one.
I feel the same way about weedy mosses!
Apologies for hijacking the thread but I wanted to chime in on weedy utrics. I've been trying to grow the weedy utrics (bisquamata and subulata) and they've been the opposite so far. I had subulata growing with longifolia for three months and it didn't spread much. It never sent up any flower stalks at all. I transplanted the longifolia while leaving the subulata in the pot and so far I see one plant left which I'm not sure is alive. I've ordered subulata seeds and they haven't germinated for me. I then ordered a small portion of subulata, potted it in peat moss, and it's dying from the looks of it.
I received bisquamata growing with a pot of sandersonii I purchased. It has sent up three flower stalks and while there is a lot, I don't think it's spreading. I crumbled up a seed pod hoping it would germinate in my Sarracenia pot but nothing happened. There is still a bunch of soil in the pot which no utric has spread to. I don't know if it's my growing conditions because my other plants are doing fine, but these weedy utrics just don't seem to want to spread for me.
I have a little experience in planted freshwater tanks, and most people in the hobby treat U. gibba as a pest and a weed. I grow it and it's grown a lot for me. On carnivorous plant forums, though, I don't really see people treating it like subulata. It seems like there are more posts about how to take care of it. It's interesting how there is this dichotomy between the terrestrial and aquatic "weedy" utrics.
Just wanted to add my two cents to the discussion.
It's not entirely impossible to get rid of U. bisquamata. U. bisquamata apparently needs lots of light. I had a pot of Drosera aliciae that was infested with U. bisquamata. Eventually the D. aliciae clumped and grew large enough to cover the entire pot. When I repotted there there was no trace of the Utricularia. Nor did any start growing in the old and new pots from the divisions.
I have a pot of U. sandersonii that is infected with U. bisquamata. The U. bisquamata was taking over but I moved the pot a few feet away from the window and the U. sandersoii is recovering. U. sandersonii had larger, broader "leaves" (photosynthetic stolons actually) with three "bumps" on the edge of the "leaves".
Grand Hotel... always the same. People come, people go. Nothing ever happens.
+2... i agree with Pebes regarding the moss