Material called a growth medium is put on the joint to keep it from getting dry and to help the two plants grow together.

VOA: special.2010.05.18

They brought in more than fourteen thousand cubic meters of fertile soil from New Jersey to make it possible to grow trees and other plants.

VOA: special.2009.10.30

But farmers grow it around the world for everything from homes to sports fields.

VOA: special.2009.07.07