Regarding disturbance...couple of years ago I was growing Streptocarpus orientalis - it is a rare Gesneriad from Thailand, it is an "annual" - it grows, blooms abundantly - sets seeds and dies. I found a fresh pic on Facebook.. https://www.facebook.com/LIGesneriad/posts/942539145795044

Anyway - several people got seeds - we all loved the plant - but I was the only one who get a LOT of seeds, the rest of the group didn't. My plant was sitting on the edge of the stand near my planting table - and I was bumping into this light stand all the time with my chair. Flowers shook - and pollinated...I got seeds and sent them to the Gesneriad Society seed fund. People tried to pollinate by hand... and nothing doing. Butt pollination worked. It is actually a known phenomenon - called buzz pollination - when the bees come and buzz and shake the flower - the flower starts shedding the pollen on the bee.

Bzzz, bzzz