I had two a few year ago in some tanks on a balcony. They were solely natural light. I did not use any fertilizers or anything. I had one in a 10 gallon with 5 African dwarf frogs that was heavily planted. I actually had a UGH in that tank. The other was in a divided 10 gallon with 2 Bettas, one on each side. I never got them to grow large enough to get branches or anything, but a few leaves. They grow very slowly but eventually start to pick up speed, but they are far from ever being fast growing. Maybe it was the set up they were in, but that was how there were for me. I was surprised that hey actually fared the winter well being mostly unprotected, this was in Los Angeles however so not that cold. I had them for about 3 years before I moved and they had each about a handful of leaves and maybe had grown 6-8 inches in height in that whole time. Hope that helps.