The utilization of plants organs other than seeds or spore, without the involvement of man is known as

Natural vegetative propagation

Explanation:

Natural vegetative propagation is the ability of  plant organs other than thier seeds and spores to naturally grow and develop without man's intervention by the formation of adventitious roots and modified stems, shoots, leaves and bulbs . Examples of the plants organs from stems and roots are  bulbs cloves, corms, tubers, Plantlets, rhizomes,and crown etc.

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