Question

What was the purpose of applying the rooting medium? Why was it applied to only one of each set and not to all of the plants?

Answer 1

by using rooting harmone  roots develop quickly at cutting and and it become  more robust than cuttings which don't receive rooting hormone. Cutting harmone is used mostly on ornamental plants in the landscape and to propagate succulents.

It cannot apply on whole plant since it will not mix with old one and a new catergory or plant will develop and it will distroy the originality of the actual plant