Aka desmodium gyrans? I have five or six happy ones. They are about a foot tall and branching, as well as growing consistently. Have not had any problems with them thus far. I give them little attention as they haven't seemed to be having troubles.
I boiled water and steeped them in it to hydrate the seeds, I did not remove them from the pod and instead, sowed directly to potting soil. This was kept moist until germination occurred, a week or two later. They were kept in humidity until they reached the dome. I transplanted them into a slightly more well draining soil and have kept moist since then. I don't know how old they are, but I would estimate six months or more. They have been fed a couple of times with a balanced fertilizer and remain moist until they dry for a day, and then get watered again. I made no ph adjustments and used only tap water. They are directly beneath lights indoors with rh of 50-60 and temps between 65-80f.
Pictures are in my grow log. Any other questions, I will answer. Good luck on your film project! I love these guys but they don't move a whole lot. I'd love to see a time lapse.