I was wondering if there were any hydroponically grown plants entered in the competition, because I've got one.
When I tried my hand at cloning I accidently compressed the rockwool when I put the hydroton in the pot and this caused the roots to become trapped inside the cube.
So my cube is as small or smaller than a shot glass in size the plant has been vegging for two months and is just about two inches tall and was taken from a mature plant a little more than two months ago the other clone I cut the same day is over a foot tall you can see from the photos I've placed a lighter to give the picture scale, it should also be noted that the roots are still contained in the cube and have not grown outside of it.
If nothing else it's good for a laugh.