What is the pro-noun for cactus?

There isn't a specific pronoun for "cactus" in the English language. Pronouns are used to replace nouns, but they are generally based on gender or number (e.g., he, she, it, they).

Since cacti are plants, the pronoun "it" is the most common and appropriate choice to refer to a cactus.

For example:

* "The cactus was prickly. It grew tall and strong."

You can also use "it" when referring to a group of cacti:

* "The cacti were in bloom. They looked beautiful."