The effect of caffeine on plant growth has been studied by the experts for some time now. People believe that exposure to caffeine would cause the plant to grow at a much faster rate and that this is a positive effect for plants. But this is just a myth and make-believe, not to mention, a total waste of perfectly good caffeine. While it does not do anything for the growth speed of the plants, research is still on progress about the real effect of caffeine on plant growth.
There are a lot of theories regarding that subject but nothing in particular seems to be the real deal. All are just theories that lack evidentiary support and therefore can not be considered as factual truth about the effect of caffeine on plant growth.
One theory mentioned above says that the caffeine can help in the growth of the plant. The believers of this myth appeal that the potassium found in caffeine helps the plant to grow faster. As this theory can be true and that caffeine can possibly help plants grow, there is still no factual evidence that it really was the caffeine that helped the growth and not other elements present. It really is hard to say without eliminating all possibilities.
Another theory is that caffeine's effect on plant growth can make the plants abnormal and retarded. That they make the growth of the plants slow down and also make plants tend to be small in size, abnormally small in size. So again we have a group of people who believe that their theory is the right one. They claim that the caffeine added to the plants stop the plants from growing. There really is no telling whatever what they claim is true or not.
There are a lot of elements to consider in finding out the effect of caffeine on plant growth. It would require controlled environment, day and night observation, and total focus to the subject. The weather is also a factor and the environment on which the plant was grown. There are factors and elements to take in consideration first before even trying experimentation with caffeine and plants.
The effect of caffeine on plant growth is really a hard one to call. It can be that the plants are growing slower because of the caffeine and it also can be a possibility that the potassium and phosphorus can cause the plant to grow much faster.