I have been trying to undwarf M. 'Truly Tiny' by artificial means. Usually mutations are dwarf because they are deficient and/or insensitive to GA. I found that M. 'Truly Tiny' is very insensitive but not completely insensitive to GA. I had an M. Truly Tiny with a 14" trunk and there was no progressive increase in petiole length or leaf size. On 2/7/17 and several times shortly afterwards, I sprayed with 25 ppm GA without any noticeable results. Then on 2/27/17, I sprayed with 500 ppm GA and on 3/4/17, I sprayed with 1000 ppm. By practical standards, 1000 ppm of GA is an enormous amount, too expensive for commercial applications. Anyway, I got results,.Photo taken today:
As you can see, the trunk has extended by about 4". I will keep you apprised of progress.