Tissue culture is a plant propagation method involving tissues or cells being removed from a live or freshly harvested plant and grown in a sterile environment. 

This technique produces clones (genetically identical copies) of the original parent plant.

It can be especially useful for strains that are difficult to propagate from seed or for growers who want to replicate a plant with desirable properties. 

Tissue culture can help preserve valuable genetics and can be used to create uniform plants that are less susceptible to disease.