When you put to in the front of plant what part speech is this?

When you put "to" in front of "plant", it creates the verb "to plant".

Here's why:

* "Plant" on its own can be a noun (a type of organism) or a verb (to put something in the ground to grow).

* "To" is a preposition when used to indicate direction or purpose.

* When "to" is used before a verb, it creates an infinitive, which is the base form of a verb, often used as a noun or adjective.

So, "to plant" is an infinitive, which acts as a verb in this case.