When you try to grow plants using another liquid, the molecules (or what makes up that liquid) are shaped differently from water molecules. Because of their different shape, they block the process of photosynthesis from occurring, so the seeds do not know they should grow!

This increase in acidity can be toxic to some plants, although others, like blueberries, enjoy it. Studies involving the use of caffeine on plants have shown that, initially, cell growth rates are stable but soon the caffeine begins to kill or distort these cells, resulting in a dead or stunted plant.

Irrigating a plant with Red Bull would greatly increase the soil solution concentration and make it difficult for the roots to absorb water. The various vitamins and other ingredients, such as taurine, in Red Bull could not be used by the plant. Photosynthetic plants make all their own vitamins and organic compounds.

Caffeine interferes with the natural physiological processes that plants experience. As the plant’s cells begin to die off, including the roots and leaves, the plant becomes less able to maintain normal functions. Growth becomes stunted, and eventually the plant becomes unable to maintain itself.

Coffee grounds (and brewed coffee) are a source of nitrogen for plants, which is the nutrient that produces healthy green growth and strong stems. Coffee also contains calcium and magnesium — both of which are beneficial to plant health. To use coffee as a plant fertilizer, you’ll need to dilute it.

Milk is a good source of calcium, not only for humans, but for plants as well. It contains beneficial proteins, vitamin B, and sugars that are good for plants, improving their overall health and crop yields. The microbes that feed on the fertilizer components of milk are also beneficial to the soil.

There are a number of common options, such as milk, juice and water, and though each one has its merits, pure water is still the most reliable liquid for optimal plant growth.

Orange juice is good for people, so it might seem logical to think it would be good for plants as well. However, that is not the case. Orange juice can stunt the growth of plants, so it is best to avoid using it. It will also leave a sticky residue that may attract insects.

Epsom salts, baking soda, and household ammonia can be combined to create a fertilizer that helps plants maintain healthy foliage and stimulates growth.