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Winn Sawyer wrote:
Benji Isho wrote:@Winn Sawyer
Gibberellins and auxins are both present in aloe vera
Source: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2763764/
'According to the results of the study, Aloe vera leaf gel can be recommended as an alternative root inducing substance to induce rooting of semi hard wood cuttings of Citrus aurantifolia and air layering plants of Syzygium jambos. It is not essential to use root inducing substances to induce rooting of soft wood cuttings of Coleus spp. In the present study freshly harvested Aloe vera leaves were used to collect gel substances. However, best results could be obtained by using leaves of Aloe vera harvested 5-7 days before being used as root inducing material. Since, Aloe vera leaves produce more rooting hormones after separated from the plant as an anti-inflammatory actions.'
Full study: https://www.researchgate.net/publication/350994926_Effect_of_Aloe_vera_Gel_for_Inducing_Rooting_of_Stem_Cuttings_and_Air_layering_of_Plants
That's good information! Take a look at the charts in that last one, though. While the abstract and conclusion say it CAN be used, it was only barely better than the control for two out of three species, and worse than the control for one of them.
Take note of the part below each table that tells you which are statistically significant. For example, for the S. jambos (table attached here), aloe gel was statistically no better than using nothing (red arrow point at the letter "b" signifying they are statistically indistinguishable), while the actual rooting hormone was 7 times more effective than aloe for root length, almost 15 times more effective in terms of number of roots, and a whopping 53 times more effective in terms of root vigor.
For the Coleus experiment, they found that neither aloe nor rooting hormone were better than doing nothing. Which shows that for some species, using nothing is best!
For the citrus, both the aloe and the actual hormone were basically identical to the control in most metrics at 2 months, and only the hormone was really much better by 3 months, the aloe and control were basically identical in number of roots and statistically the same in root vigor. Average root length at 3 months was basically the only metric where the aloe was almost as good as the actual hormone (i.e. statistically better than the control), but even still the hormone averaged roots 1.5cm longer than the aloe.