bonasi = Bonsai can be created from nearly any perennial woody-stemmed tree or shrub species which produces true branches and remains small through pot confinement with crown and root pruning.

so yes, it can be done, but you have to trim the roots. and that doesn't mean that it will necessarily be easy. i don't know as i have no experience with it myself. there is a post around here where i was told that this guy grew i think around a 4' plant in a 4" pot. it's not recommended, but can be done.

as far as the nyquil cup, did you read anything about that one? it could have been a cutting that was put into there. it could have been from seed. why don't you try it out and see what happens. it's kinda silly IMHO.

Conclusion

In the first pair of images, the plants are kept small simply by controlling the root zone. Other problems can arise from this technique such as root bounding which may cause the plant to stop growing. It will require you to learn root pruning. But, there are other techniques that can help you keep the plant within the confines of the space you provide. It may seem difficult or overwhelming, but you can get the hang of it quickly.
this came from the third link that you gave me.


-shake