Athickened horizontal stem that grows underground and produces flowering plants such as canna and bearded iris is called a

The answer to this question is the term rhizome. A rhizome is a stem of a plant that is growing underground and is growing horizontally. It is also known as rootstocks. The rhizome's function in the plant is that it is used to store starches and protein that enables the plant to grow underground.

No they’ve not done that