That is the only way I found to grow mine and I've had it at least 3 years. I have it in the largest ice bucket I could find and the largest cake lid I could find from a Sam's Club cake. I lost my first one because I didn't have it in a terrarium.
A member of our local branch is growing it out of a terrarium, but he has it in a climate controlled (heated and cooled) greenhouse. It will survive for a short time in warm humid weather outside but for long term survival a terrarium is necessary. :(