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Depends on your plant and its size.

In dicots, the xylem in the interior of the stem becomes "heartwood" as the plant gets bigger, and in this state helps hold up the tree. Reversing xylem and phloem in this situation would give you a plant without heartwood and therefore not able to grow to a large size.

In monocots, no problem. Monocots have "vascular bundles" which have both xylem and phloem; these occur throughout the stem.

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12y ago

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