I read this thread on a fig forum.
https://www.ourfigs.com/forum/figs-home/291461-rooting-cuttings-can-we-reduce-the-process-to-its-essenceIt caused me to ask the same question about rooting citrus cuttings. From this posting:
Question: What are the essential components of an environment that will cause wood to sprout? Under proper conditions, we should need no medium at all, other than air -- a stick of fig wood suspended magically in the air could sprout roots, if other conditions were suitable. If so, then everything non-essential might simply complicate the process and reduce the probability of success. The non-essentials could be eliminated, boosting the probability of success.The poster in this thread found that fig cuttings will root without being stuck into a growth/rooting medium. Can this be true of citrus? In other words, what are the essential conditions required for rooting citrus cuttings?