My mini cherry plant got uprooted one night and i have yet to find it, LOL. I think they do better in shrimp-only tanks as they are VERY easily uprooted. I don't really even think they have a root system... but i can't confirm that, since i haven't had mine very long... but it did not come with any roots. It's like a moss. They definitely require pressurized co2, lots of ferts, good amount of light, good substrate (if you plant it in the soil), etc. Soft water probably wouldn't hurt either.
Edit: Maybe they're easier to care for than i've experienced.
http://www.plantedtank.net/forums/sw...lants-new.html