Reading this post and the replies, with due respect to all, indicates a lack of knowledge of the plant in question. These plants, like many plants, are epiphytes and are free to grow where ever they wish, thus, you will never keep them in a pot. They are also very intolerant of water without great drainage, again as per epiphytes. The following pic is my plant of Milt Guanabara, a spectabilis hybrid. Its growing in a wire basket lined with shade cloth and the mix is coarse bark. I can water it daily but it never stays wet. It hangs in this position all year round.
Wonderlen has it correct.