Discussion with a person who brings in large amounts of Buce. Buce talk starts at ~6:45.
I've seen this as well.
I think at least on youtube, this guy below has the most impressive buces grown emersed.
The most important thing seems just to be some aquasoil (he uses fluval stratum so very low ferts), low light, cool temperature, for as long as you can possibly wait.
I asked him a year or so back how his was doing, and he said they ended up getting fungus due to a temperature spike at his place. So cooler temperatures absolutely help with keeping them stress free.
4:18 is where you can see them.




