process of increasing plant numbers. both sexually and asexually.

Merriam-Webster Online Dictionary
propagation (noun)
the act or action of as - propagating
a) increase (as of a kind of organism) in numbers
b) the spreading of something (as a belief) abroad or into new regions
c) enlargement or extension (as of a crack) in a solid body
propagation (Wikipedia)

Propagation can refer to:

In music
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