I got a small plant of Begonia pteridiformis in the mail on September 21st of 2017 from a friend, and it has thrived since then. It has bloomed, but my attempts to release pollen and pollinate the female flowers have failed. I'm told it's one where using something to get vibrations (such as an electric toothbrush) can help release the pollen.

Here's my plant in bloom on November 16th:

However, I have found it very easy to propagate from it's small leaves, or even pieces of those leaves. Actually, I've found one of the biggest problems using leaf fragments is telling the orientation of those pieces. So it's easier if one limits the number of pieces to about 3, although I think it's possible to push it well beyond that.

Here's one of the plants I propagated, one January 1st:

And then over an 18 day period ending today:

I took more cuttings today, all of them from very young plants. Often the plants had as few as 3 leaves, and so I took just one. Or in some cases none. Here's what I ended up with, about 30 small leaves. I only cut the largest 4 or so into half.

And inserted into moist perlite:

I expect many or most of these will root and yield plants.