Planto,
It is as if they have a mind of their own. After reading Plants having a mind I am cautious about how and why plants do what they do. Some have the will to live while some lose it and doesn't care if they slowly die. Compare a cross-breed (hybrid) with regular. The hybrid will almost always grow double the rate as the parents it came from. Seems being new seems it doesn't know about living or dying. Takes the high road and wants to live. I also believe seeds will in the long run, outdo clone cuttings. Seems the mind is in the first root system to form. It is stronger then roots coming later out of the stems.
Oh-well, getting way off topic. Nice plants.
Stush
