I think the amount of variegation can also be affected by fertilizer type and amount of shade. I had a variegated banana that used to burn on the white parts, and I put it in some rather strong shade, the variegation lessened quite a bit. The next summer it was in more sun, and grew much more variegated. I've heard of others that used a high nitrogen fertilizer and the variegated bananas got much more green. I've had some variegated Clivias for over 10 years, there is only one plant that is not strongly variegated. None of the plants have changed variegation amounts significantly over that time. How old and how many leaves did the Clivias have when they reverted? Susan B East TN