As with my past experience with these types of Begonia, they don't do much of anything. The flowers are small and tend to get lost in their surroundings (which should speak volumes when their surroundings is pretty much just an empty mulched bed). The size they are at the time of planting is about as big as they will ever get. They do not seem to get much of a spread or growth. If you wanted an impactful planting with this, or to create a mass effect, you'd be best off planting them literally container to container, since they do not grow much larger than they are at the time of planting.

Recommendation: Do not use again, there are surely better cultivars (or even species!) out there.