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Scientists Help Cut the Mystery Behind Pruning.
Teams in Canada and Europe talked last week about when and how to prune plants.
Researchers have known since the nineteen thirties that the actively growing tip of a plant releases a hormone called auxin. The research suggests that to grow, they have to be able to export the hormone into the main stem.
The new research shows that the buds on the side cannot export their auxin into the main stem because it is too full. They are no longer inhibited from growing.
Ottoline Leyser from the University of York says that after a plant is pruned, all the inhibited shoot tips compete with each other to grow.

http://www.voanews.com/specialenglish/archive/2009-10/2009-10-12-voa2.cfm

impression
I am good at the form that is mystery of the grass; became it, and intended, but thought because should have made it among midnight that was serious at all.
I want to make mystery of the grass.