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It seems like everything has pith, from walnuts to ragweed. I can't figure out what good it does them. Why do plants have it and how is it useful to them?

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This question is the topic of a meta post. Please participate in this discussion on the scope of biology questions. –  Lorem Ipsum Nov 14 '11 at 15:20
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1 Answer

up vote 2 down vote accepted

From the Wikipedia article on Plant Pith:

Pith is composed of soft, spongy parenchyma cells, which store and transport nutrients throughout the plant.

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Can you provide more details or a comprehensive answer than a simple copy-paste of a single line from wikipedia? If you're not keen on it, then perhaps you should consider posting that as a comment –  Lorem Ipsum Nov 6 '11 at 19:04
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