New cells in plants are reproduced in meristematic tissues. These are special tissues found in specific locations in the plant body where cells are actively dividing and differentiating.

Here's a breakdown:

* Apical meristems: Located at the tips of roots and shoots, these are responsible for primary growth, which increases the length of the plant.

* Lateral meristems: Found in the vascular cambium (producing vascular tissues like xylem and phloem) and the cork cambium (producing bark), these are responsible for secondary growth, which increases the girth of the plant.

There are also intercalary meristems, which are found at the base of leaves and nodes in grasses, allowing for rapid growth and repair.

So, the answer to your question is: Meristematic tissues are where new cells are reproduced in plants.