I agree with Brazilian Pennywort. I was disappointed when I first got them from an online retailer, cuz they looked like scrawny asparagus sprouts and nothing like the pictures, but after just throwing them in the water with the lead weights keeping them down, they have bloomed in to my favorite plant in the tank and it grows noticeably from the time I leave work in the morning to the time I arrive home (9am - 5pm). Pretty plant, don't have to actually plant them in the substrate, and they grow well.