If the above is true, then it would be beneficial to wash out the coffee after a period of time and let the plant restore its normal hormonal growth processes. I wouldn't use coffee in the winter time when growth hormones are not naturally being synthesized (in high amounts like in spring and summer) because of the hindrance of growth we normally see in plants in the winter. but this does not apply to greenhouse plants or plants in climates that aren't really affected by seasons and grow year-round.
I am also not saying that this is the only thing happening here. the lowering of the pH in the substrate is also an interesting concept, and there are likely many other chemical aspects of plants that are being affected by coffee compounds. The auxins were just one major aspect i looked at at length.
I am also not saying that this is the only thing happening here. the lowering of the pH in the substrate is also an interesting concept, and there are likely many other chemical aspects of plants that are being affected by coffee compounds. The auxins were just one major aspect i looked at at length.
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