First and foremost, the stimulating effect of Kelpak has little to do with the contained hormones. Sure, they do stimulate growth, but the degree of stimulation is far beyond what one can expect from such low concentrations.
Secondly, auxins and cytokinins are NOT antagonists.
In a plant, where they are naturally produced, when the vegetative meristem grows, auxins are released that travel down through the vasculum and stimulate the growth of roots. As the root meristem grows, cytokinins are released that travel upward to stimulate vegetative growth.
Not only do they keep the plant and root system growth "in sync", but the ratios can control morphology. When a tree is small, it will tend to be a single shaft of growth. As it gets bigger, due to differences in the transfer rates of the two classes of hormone, the vegetative meristem is signalled to split, resulting in the formation of multiple branches. As it continues to grow, the splitting becomes even more pronounced, leading to the growth of the entire canopy of branches and twigs.
That is not seen in plants as small as orchids.
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