"Learn to stay away from alien plants, if you can."

But one reason the problem exists is that alien plants can be so darned pretty.

One of them is an alien plant, the other is native.

Together, they managed to wrest the alien plant from the ground.

An alien plant that was almost indestructible and lived on blood.

Many of the alien plants also behave as if they were on a conquest.

And that would be very difficult, for the importation of alien plants to Earth was forbidden.

Through time, soil erosion will result in harvesting alien plants.

Everywhere we went there were strange alien plants and pollen.

It is not the first time we have tried to introduce an alien plant to the soil of Earth.