The type of tissue that produces new plant cells is called meristematic tissue.

Here's why:

* Meristematic tissue is made up of undifferentiated cells, meaning they haven't specialized into a specific type of cell yet.

* These cells have the ability to divide rapidly, creating new cells that can then differentiate into various types of plant tissue.

* This constant cell division allows plants to grow and develop throughout their lives.

There are two main types of meristematic tissue:

* Apical meristems: Found at the tips of roots and shoots, responsible for increasing the length of the plant.

* Lateral meristems: Found in the cambium layer, responsible for increasing the girth (width) of the plant, leading to secondary growth (e.g., woody stems).

So, whenever you see a plant growing taller or thicker, you can think of the hardworking meristematic tissue diligently producing new cells!