When it comes to propagating plants in water, it is generally not necessary to add anything to the water. However, there are a few exceptions where adding certain substances to the water can be beneficial for the propagation process.
1. Rooting hormone: Rooting hormone is a substance that stimulates root growth in plant cuttings. It can be especially helpful for difficult-to-root plants or for speeding up the rooting process. You can find rooting hormone in powder, gel, or liquid form at most garden centers. Simply dip the cut end of the stem in the rooting hormone before placing it in water.
2. Liquid fertilizer: While not essential, adding a diluted liquid fertilizer to the water can provide some nutrients to the cuttings as they root. Be sure to use a well-balanced fertilizer with equal amounts of nitrogen, phosphorus, and potassium. Follow the instructions on the fertilizer packaging for dilution ratios and frequency of application.
3. Activated charcoal: Adding a small amount of activated charcoal to the water can help prevent fungal or bacterial growth. Activated charcoal acts as a natural filter, absorbing impurities and toxins. This can be particularly useful if you notice that the water in your propagation vessel becomes murky or foul-smelling. Simply sprinkle a small amount of activated charcoal into the water, or place a charcoal filter in the vessel.
4. Hydrogen peroxide: Hydrogen peroxide can be used as a disinfectant to help prevent the growth of harmful bacteria or fungi in the water. It can also help oxygenate the water, which can benefit the roots of the cuttings. Add about one teaspoon of hydrogen peroxide to a gallon of water and mix well before using it to propagate your plants.
Remember, it is important to monitor the water in your propagation vessel regularly. If it becomes murky or you notice any signs of fungal growth, it is best to replace the water to maintain the health of the plant cuttings. Additionally, make sure to use fresh, tepid water and avoid using chlorinated water, as chlorine can be harmful to the delicate roots.
In my personal experience, I have found that most plants can successfully root in plain water without the need for any additives. However, I have used rooting hormone on difficult-to-root plants such as roses and found it to be quite effective in promoting root growth. I have also used diluted liquid fertilizer on occasion to provide some nutrients to the cuttings, especially if they appeared to be struggling. I believe that the choice to add anything to water when propagating ultimately depends on the specific plant species and your personal preferences.
