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Since you are asking this question, I will assume you know the lifespan of a dandelion. (If you do not, then it has a short life compared to other flowering plant species.) If the dandelion's only purpose is to send out its seeds and die, it has no need to use extra resources reinforcing its stem. The way it has its stem right now is a good enough stem to support the plant for its life. It does not need the material to make a full stem because it has a very simple goal. As long as it can transport the water and dissolved nutrients to the leaves, then it can carry out its purpose in life.

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12y ago
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Q: Why do dandelions have a hollow stem?
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