I unpotted my 2 dormant s.tubiflora just now, and realized that I had made a couple of mistakes right off the bat. These were given to me as 2 stem cuttings last summer, and were rooted/grown in 4" plastic pots.

My first mistake was to snap off the dead stem about 1" above the tuber, realizing only then that the inside of this stem looked very much alive. Did I make a serious error here?
Second, after potting up the tubers, I saw in pictures that the tuber is usually left half exposed on the medium surface, and is rather shallowly potted, almost like a bonsai.
The tubers measure ~1" and 2" across, and have substantial root growth from the top of the tuber. Considering the apparent success of these tubers being fully underground, am I asking for trouble if I plant them deep again?

Thanks,

--Rick in CT