To propagate cucumbers, the most common method is to plant seeds from a mature cucumber, but you can also propagate them by taking stem cuttings from an existing plant and rooting them in moist soil; ensure the cutting has at least one set of leaves and use rooting hormone for better results. 

Key steps for propagating cucumbers from seeds:

  • Collect seeds: Harvest seeds from a fully ripe cucumber on the vine. 
  • Prepare seeds: Soak the seeds in water for a few days to remove the gel-like coating. 
  • Plant seeds: Sow seeds in a seed starting mix, covering them lightly with soil. 
  • Provide warmth and moisture: Keep the soil moist and place the seedlings in a warm location to encourage germination. 

Key steps for propagating cucumbers from cuttings:

  • Choose a healthy plant: Select a healthy cucumber plant with vigorous growth. 
  • Take cuttings: Cut a 4-6 inch stem section with at least one set of leaves, preferably just below a leaf node. 
  • Remove lower leaves: Remove the bottom set of leaves to expose the stem where roots will develop. 
  • Apply rooting hormone: Dip the cut end of the stem in rooting hormone to stimulate root growth. 
  • Plant in potting mix: Insert the cutting into a pot filled with moist potting mix, burying the cut end slightly. 
  • Maintain conditions: Keep the soil moist and place the cutting in a warm, bright location. 

Important points to remember:

  • Choose the right variety: Select cucumber varieties suitable for your climate and growing conditions. 
  • Open-pollinated varieties: If you want to save seeds to propagate again, choose open-pollinated cucumber varieties. 
  • Transplanting: Once the seedlings have developed a strong root system, carefully transplant them to a larger pot or directly into the garden.