Native plants live in very specific habitats. native plants can become extinct if are planted and take over the space, soil, and nutrients needed by native plants.

Invasive species

Explanation:

A native plant or species is also called as the indigenous plant or species. As it lives on the land where it has taken birth considering in a given area and in a considered geological time.  

An invasive species or invasive plant is the one which is introduced to the other land in search for food, resources and other needs either accidentally or intentionally by the human population. This species competes with the native plant species for resources like space, soil and nutrients.

the correct answer would be 6 feet.