This is a great question, since most places are either too hot or too cold or both to grow it outside.. I live in one of those rare areas (SF Bay area, and frost free location at that) where it does great outside all year, and reaches 12 feet. I propagate it inside from seeds and stem cuttings, but it was very bad at producing seeds last summer and Fall. The latest inflorescence got broken off, but I counted six more at various stages. So hopefully soon I'll have some seeds and/or plants temporarily inside.... I consider it pretty easy from seed, as Begonias go. It's worth adding that a well grown plant would be striking indoors. There seems to be a fair bit of lore that it is difficult inside. I suspect that's incorrect, and one just needs to understand its needs. And perhaps also its pests. I wonder if broad mites are a problem inside. I say that because I've seen plants that "seem" to be weakened, but with no obvious pests... Your plant looks great, by the way!

It is easy from stem cuttings like Randy mentioned. Because I have to bring it indoors for winter, I keep them somewhat shortened (hence the cuttings are easy statement). I don't think I've ever seen any of mine bloom so no worries about getting any seeds - haha! I do keep mine wetter than a lot of other begonias which is kind of strange but we do what we have to do to keep them happy.

Although they can get to staggering heights which is somewhat impressive, I really don't want a step ladder to see the blooms up close and personal. The best I've seen are kept at a lower height - fuller, bushier, healthier looking plants to my own view. Now if mine would actually do this would be another thing - maybe a greenhouse might be the answer. The one I saw on FB may have been knee-high and looked like a dense hedge instead of bamboo sticks. I wished I could find the location and provide a link to it.

Anyway, it is an easy plant to grow if you pay attention to its whims.

Randy, I like the looks of that so much better than this:

http://1.bp.blogspot.com/-igu94fbAvBM/VdzEQWptwrI/AAAAAAAAfkM/JjsDtoBTkn4/s1600/DSCF0228.JPG

Thank you! both! I was wondering if you could tell me what their growth is like? I see that they develop woodier stems as they increase in height, mine is currently a single stem, will this become more woody as it grows?

Yes, as it ages it should become semi-woody. Just like most canes develop a semi-woody stem if you let them grow for a few years without cutting them down. How tall is your ceiling? You may be cutting it back before it gets that tall though!

My ceilings are 10' with floor to ceiling windows facing south and east-south-east.

You should have some giants then! Will be looking forward to seeing them when they get to those sizes.