Even the driest stick will take root. A teaspoon per liter of water

It sounds like you’re describing a rooting technique that uses a small amount of a rooting stimulant or a natural rooting aid dissolved in water. While many plants can root from cuttings in plain water, certain substances can enhance the process, especially for more challenging species. Here’s a breakdown of what might be involved:  

Possible Substances and Their Roles:

• Rooting Hormone (IBA or NAA):
  • These are synthetic plant hormones that stimulate root development. They are commercially available in powder or liquid form.  
  • A very small amount is typically used, as excessive concentrations can inhibit rooting.
  • If using a rooting hormone, always follow the products instructions.
• Willow Water:
  • Willow bark contains natural rooting hormones, particularly salicylic acid.
  • Soaking willow twigs in water creates a solution that can promote root growth.
  • This is a natural and effective method.
• Honey:
  • Honey has antifungal and antibacterial properties, which can help prevent cuttings from rotting.  
  • It also contains trace amounts of plant hormones that may stimulate rooting.
  • A small amount of honey can be dissolved in water or applied directly to the cut end of the cutting.  
• Apple Cider Vinegar:
  • A very diluted solution of apple cider vinegar can help to acidify the water, and provide some nutrients. It also has some antifungal properties.
• Aspirin:
  • Aspirin contains salicylic acid, similar to willow bark, and can promote root growth.
  • A very small amount of dissolved aspirin in water can be used for rooting cuttings.

General Rooting Cuttings in Water Technique:

1. Prepare the Cuttings:
   • Take healthy cuttings from the parent plant.
   • Remove lower leaves, leaving a few leaves at the top.
   • Make a clean cut at a 45-degree angle.
2. Prepare the Water:
   • Use clean, room-temperature water.
   • If using a rooting stimulant or natural aid, add the appropriate amount to the water. A “teaspoon per liter” suggests a very diluted solution.
3. Place the Cuttings:
   • Place the cut ends of the cuttings in the water, ensuring that the leaves are above the waterline.  
4. Provide Optimal Conditions:
   • Place the cuttings in a warm, bright location, but avoid direct sunlight.
   • Change the water every few days to prevent bacterial growth.
5. Wait for Roots:
   • Roots should start to develop within a few weeks.
   • Once the roots are a few inches long, the cuttings can be transplanted into soil.  

Important Considerations:

• Plant Species: Not all plants root readily in water. Some prefer soil or other rooting mediums.
• Hygiene: Cleanliness is crucial to prevent rot.
• Dilution: The “teaspoon per liter” measurement emphasizes the importance of using a very diluted solution. Excessive concentrations can be harmful.
• Always research the specific plants you are trying to propagate, so you know the best method.