The little bamboo tree had been growing underground for the past four years, in the fifth year and beyond, it developed a rootsystem strong enough for its ground growth.
过去的四年里，这株小竹子一直在地下生长，第五年开始，它形成了足够强大的根系，可以在地面生长。
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A group of thousands of aspens can actually constitute a single organism, called a clone, that shares an interconnected rootsystem and a unique set of genes.
It spreads primarily by underground stems; colonies form when pieces of the rootsystem or whole plants float into an area and take root or when seeds float into a suitable area and germinate.